Weight And Balance · Volume 1
Weight and Balance — the Spine of the Whole Build
Introduction
Most of the decisions in this project turned out to be the same decision wearing different clothes. Whether to fit a bull bar, which rooftop tent to buy, whether the suspension needs upgrading, where the water cans mount on the trailer, how much the storage system is allowed to weigh — every one of them resolved to a question about weight, and where it sits.
This page is the through-line. It carries the numbers that govern everything, states the two constraints that cannot be violated, and points into the volumes that do the detailed work. If only one page of this project is read before a trip, it should be this one.
1.1 The two numbers
🔴 The truck may carry 1,100 lb, total, including people.
⚠ Read that off the truck’s own Tire and Loading label — not the brochure. Nissan publishes 1,220 lb as the maximum for this configuration; this specific truck, with the options actually fitted, is 120 lb below it.
🔴 A trailer is ALWAYS attached. Owner’s policy, 2026-09-03. The truck carries only what is bolted to it, riding in it, or medical; everything else lives in bins that move between the two trailers.
🔴 The trailer’s tongue is 101.5 lb — 8.50 percent, against a 10 percent floor. It is 17.9 lb too LIGHT, and a trailer below its sway floor is a control problem, not a comfort one.
Everything else follows from those. ⚠ The tongue figure reversed direction in September 2026 — this page used to give a 132–162 lb window with a 155 lb target, which was correct for a 1,319 lb trailer carrying a fridge, a house battery and eight gallons of water. The trailer now grosses 1,194 lb and the problem is sway, not payload. → Trailer Build vol 3.
The 1,100 lb is the figure on this truck’s door-jamb Tire and Loading Information label — “the combined weight of occupants and cargo should never exceed 1100 lbs or 499 kg.” It is not a target or a guideline; it is the figure the truck’s brakes, tyres, wheel bearings and frame were engineered around.
⭐ The trim and the fitted options together cost 230 lb. Nissan publishes 1,330 lb for the base Crew Cab 4x4 and 1,220 lb for the PRO-4X — the Bilstein shocks, the locking differential, the skid plates and the all-terrain tyres are themselves weight. 🔴 And this truck’s own label reads 1,100 lb, a further 120 lb below the brochure figure, because the published number is a maximum for the configuration while the door-jamb label accounts for the options actually fitted. The trim that is best at going off-road carries the least gear off-road — and the options make it worse.
The tongue limits come from two completely different places, which is why they can cross. The floor of 119.4 lb is physics: below about 10 percent of trailer gross, the trailer’s centre of gravity sits too near its own axle, it begins to hunt, and sway feeds itself until it becomes uncontrollable. The ceiling of 126.0 lb is simply what is left of the truck’s payload once everything else is aboard — the 1,100 lb label less the 974 lb of truck items.
⭐⭐ For most of this project the floor sat 45.6 lb ABOVE the ceiling, so no tongue weight was both stable and legal. The bins policy closed that gap. Moving 58 lb of portable kit off the truck lowered the truck’s load and raised what it can afford to carry on the ball, and a valid window now exists: 119.4 to 126.0 lb, or 10.00 to 10.55 percent.
⚠ It is 6.6 lb wide, and the rig is not yet inside it — the tongue as modelled is 101.5 lb. 🔴 And only the very bottom of the conventional 10–12 percent band is affordable: 12 percent would be 143.3 lb, putting the truck 17.3 lb over the label. → Weight and Balance vol 3, Trailer Build vol 3.
1.2 The ratings, read off the truck
The certification label on the driver’s door jamb gives the numbers the vehicle was engineered to:
Table 1 — The certification label on the driver's door jamb gives the numbers the vehicle was engineered to
| GVWR | 6,012 lb — the most the whole loaded truck may weigh |
| GAWR front | 3,296 lb |
| GAWR rear | 3,434 lb |
| ✅ Measured curb weight | 4,851.3 lb — two certified tickets, 20 lb apart, agreeing to a tenth of a pound |
⚠ The axle ratings carry a condition that is easy to miss: they are certified “with 265/70R17 tyres, 17 × 7.5 rims, at 35 PSI cold.” Change the tyre or run a different pressure and the stated rating no longer applies as certified. That is the specific mechanism behind the Tires and Wheels dive’s rule that load rating comes before tread pattern.
⭐ The front and rear ratings sum to 6,730 lb against a GVWR of 6,012. That is normal and it means something useful: neither axle is the binding limit — the total is. A bound makes this rigorous rather than hopeful, and it is worked below.
1.3 The tongue loads the rear axle by more than it weighs
The hitch sits behind the rear axle, which makes it a lever in the same way the front bumper is one at the other end. For tongue weight T with the hitch roughly 45 inches behind the rear axle on a 126-inch wheelbase:
- the rear axle gains
T × 1.36 - the front axle loses
T × 0.36
Table 2 — The tongue loads the rear axle by more than it weighs
| Tongue | Rear axle gains | Front axle loses |
|---|---|---|
| 101.5 lb — as modelled today, below the floor | +138 lb | −37 lb |
| 119.4 lb — the 10% sway floor | +162 lb | −43 lb |
| 126.0 lb — the payload ceiling | +171 lb | −45 lb |
⭐ That front-axle loss is the mechanism behind “too much tongue weight makes the steering go light.” It is not a feeling; it is weight coming off the front tyres, which are also the ones doing most of the braking. ⭐⭐ It is also a free measurement: weigh the truck coupled and uncoupled on the same visit, and the front-axle drop divided by the tongue weight measures the overhang-to-wheelbase ratio empirically — validating the ×1.36 and −0.36 pair every calculation in the Trailer Build dive rests on. 🔴 If the front barely moves, the tongue is lighter than you think.
And the rear axle is still not the binding constraint. Take the worst case — assume every pound of payload lands on the rear axle, which cannot actually happen:
⭐ This is now MEASURED rather than assumed. The scale ticket gives a 51.9 front / 48.1 rear split with the driver aboard and the bed empty — the project had assumed 44 percent rear.
Table 3 — The tongue loads the rear axle by more than it weighs
| Rear axle, measured at W2 | 2,580 lb |
| Every remaining pound of payload, on the rear | +739 lb |
| Worst-case rear axle | ~3,319 lb |
| Rear GAWR | 3,434 lb |
| ✅ under by 115 lb |
🔴 So the payload label is the limit that binds, and it binds first. ⭐ The axles are not the constraint, and that is now a measurement rather than an inference — which takes tyres and suspension off the critical path entirely. → Suspension and Armor vol 5.
1.4 Where the weight actually is
⚠ This table is generated by build_weight_tables.py from the same item list the loadout calculator uses. Nothing in it is hand-typed, so this page and the tool cannot drift apart. Re-run it after any change.
Table 4 — Where the weight actually is
| Weight | Note | |
|---|---|---|
| Truck — fixed equipment | 577 lb | DECKED 177 · tent 139 · rack 115 · awning and uprights 64 · running boards 47 · radios 19.8 · hitch 15.2 |
| Truck — two adults | 392 lb | MEASURED. The largest line in the budget, and the one always forgotten |
| Truck — systems | 5 lb | CPAP kit 5 |
| Tongue weight from the trailer | 101.5 lb — 8.50% | 🔴 17.9 lb BELOW the 10% sway floor. Close it by moving load FORWARD, never by trimming tongue. MEASURE it, do not infer it |
| TRUCK TOTAL — trailer coupled, THE BASELINE | 1,075.5 lb | ✅ under the 1,100 lb label by 24.5 |
| Trailer gross | 1,194.1 lb | against a 2,000 lb load rating — 40% used |
| Retired no-trailer case, contrast only | 1,220.1 lb | over by 120.1 — ⚠ not a configuration the owner plans. A trailer is always attached |
🔴 Not weighed, not estimated, and therefore counted as nothing above: Camp chairs, pair, Camp grill. Every total on this page is a lower bound.
⭐ The asymmetry is still the most useful fact about the trailer: it runs at 40 percent of its load rating while the truck’s margin is measured in tens of pounds. ⭐ And because a trailer is now always attached, that spare capacity is available on every trip rather than on the minority of them. 🔴 But “put everything on the trailer” still does not follow. The tongue is 17.9 lb below its sway floor, so weight added over the trailer’s axle makes the stability problem worse rather than better. What the trailer needs is not more load — it is the load it already has moved forward. → Weight and Balance vol 3, Trailer Build vol 3.
⚠ Two lines deserve naming because they are invisible in most build discussions. DECKED is 177 lb — the heaviest single item on the truck after the occupants, and 16 percent of the entire payload, for storage. And two adults at 392 lb, measured, is the largest line of all — 36 percent of the label.
⭐⭐ The headline, and it is the first time this project has been able to write it: the rig fits. At 1,075.5 lb against a 1,100 lb label the truck is under by 24.5, with a trailer coupled, on every trip. 🔴 The unresolved problem is no longer payload — it is the tongue, and Weight and Balance vol 3 is the volume about that.
🔴 Two lines in the generated table above have no weight at all. The camp chairs and the grill are named by the owner, come on every trip, and have never been weighed. They are carried as FILL rather than as a guess, which means every total on this page is a lower bound. ⚠ A guessed weight inside a payload calculation is worse than a visible hole. Weigh them.
1.5 The three rules
1. 🔴 The Anker SOLIX F3000 does not travel in the truck. At 91 lb it is the difference between legal and not. The Vehicle Power dive reached the same conclusion independently and for different reasons — it is a 91 lb, AC-centric home-backup product that cannot be alternator-charged at DC-DC rates. It belongs at the house and at base camp.
2. 🔴 REVERSED 2026-09-01 — dense weight now goes FORWARD, in the front of the trailer. This rule used to read the other way, and it was right when the tongue was too heavy. It is now the opposite problem: only 16 percent of the trailer’s cargo sits ahead of the axle against a 60 percent rule of thumb, and the tongue is 17.9 lb below the sway floor. ⭐ Roughly 38 lb of always-aboard bin gear moved to 60 in ahead of the axle closes the gap outright, landing the tongue at 119.6 lb — 10.02 percent, just inside the window — with the truck still 6.4 lb under its label. ⚠ Take it from what is always aboard, never from the e-bikes — tongue weight borrowed from the bikes disappears on every trip they stay home. → Trailer Build vols 2–3.
3. 🔴 Never trim tongue weight below 10 percent to buy truck payload. That trades a payload problem, which degrades gradually and visibly, for a control problem, which does not. 🔴 And strap everything down: a load that shifts in motion changes tongue weight as it moves, and that is itself a sway cause. ⚠ Tongue weight must be MEASURED, not inferred — it never has been, and the bare-trailer constant underneath it is a 50 lb estimate carrying half the figure.
1.6 The three things that do not work
These come up repeatedly and each is answered in full elsewhere. They are collected here because they are the ways people try to escape the arithmetic.
🔴 Stiffer springs and shocks do not add capacity. GVWR is a system certification across frame, axles, bearings, brakes, wheels and tyres. The spring is one link in the middle of the load path and not the weakest. A spring does nothing whatsoever for braking, which is the limit that actually matters. Worse, sag is a free, visible overload gauge, and stiffer springs delete it — a painkiller for a broken leg. → Suspension and Armor vol 5.
🔴 A bull bar cannot be fitted, and would not help. Nissan’s own manual names brush guards as a metallic object not to attach near the forward radar, which is standard on this trim and not deletable. The underbody protection it is imagined to give is already fitted from the factory. And a steel bumper with a winch is 19 percent of the payload. → Suspension and Armor vols 1–2.
🔴 A trailer is not a one-for-one fix. Moving 300 lb to the trailer does not remove 300 lb from the truck — it converts cargo into tongue weight at roughly 10 to 15 percent of the trailer’s total loaded mass, its own tare included. ⭐ Which means the trailer’s tare weight is itself a payload cost, and on this build a light trailer is worth more than a strong one. → Bed Rack and Awning vol 4, Trailer Build vols 1–2.
1.7 What to do before a trip
Open the loadout calculator, at The Trailer/Trailer Build/02-inputs/worksheets/. Set the quantities for the trip and the position of the water on the rail; it returns trailer gross, tongue weight in pounds and percent, the truck’s total, the payload margin, and a pass or fail against both limits.
⭐ The rail is a trim control. It runs five feet front to back centred over the wheels, so water mounted on it is worth about 9.5 lb of tongue per foot moved, per 100 lb carried — roughly 48 lb of authority across its full range, against a window only 30 lb wide. Mount the water at or near the axle by default, so the truck’s number does not change as the water is consumed, and use position only to correct a measured tongue weight.
1.8 What is still measured rather than calculated
⚠ The calculator is only as good as its constants, and three of them are still estimates.
Table 5 — What is still measured rather than calculated
| Constant | Status | How to settle it |
|---|---|---|
| Truck payload | ✅ 1,100 lb, read off the label | Tire and Loading Information sticker |
| L, coupler to axle | ⚠ estimated 126 in | Tape measure, trailer level |
| Bare-trailer tongue weight | ⚠ estimated 50 lb | Platform scale, empty trailer — a one-time constant |
| Truck axle weights | ✅ measured — W1 2,780/2,580, W2 2,800/2,580 | done; the weigh series continues through W5 |
| Actual tongue weight | 🔴 never measured | 660 lb platform scale under the coupler |
| Bare-trailer tongue | 🔴 estimated 50 lb — 68 percent of the current tongue figure | 660 lb platform scale, empty trailer. This one comes first |
🔴 Buy a 660 lb digital platform scale, not a tongue scale. The smallest tongue scale made has 20 lb graduations and ±2–3 percent of full scale accuracy — ±20 to 30 lb on a 155 lb tongue, wider than the entire window. A $40 shipping scale reads it to a tenth of a pound. → Trailer Build vol 4.
One certified-scale trip gives the truck’s axle weights and the trailer’s axle weight, and with the platform-scale tongue reading it gives trailer gross. ⚠ Do not try to get tongue weight from the truck-alone-versus-coupled difference: 20 lb graduations on two 5,500 lb readings gives ±20–40 lb on a 30 lb tolerance.
1.9 The configuration that was retired
🔴 SUPERSEDED BY VOLUME 3 — and the tables that were here have been removed rather than annotated.
This section used to work through a truck-only load plan built on a house battery, a fridge, eight gallons of water, 35 lb of bedding, an 89 lb awning-and-uprights figure and two adults at 350 lb. Every one of those numbers is now either measured or gone from the build, and a table that lists an item is asserting the item is aboard. 🔴 This project has already published a subtotal that summed four items that did not exist; the fix is deletion, not a note above the table.
What replaced it: Weight and Balance volume 3 rebuilds the load plan on the always-a-trailer footing and generates its tables from the loadout calculator so they cannot drift again.
⚠ An intermediate version of this page then argued the opposite of both: that the deep two-track trip carried no trailer, that it was the majority case, and that it was 120 lb over. 🔴 The owner’s bins policy retired that premise on 2026-09-03, and volume 3 was rewritten rather than bannered. The no-trailer figures are kept there as a labelled contrast and nothing should be planned against them.
⭐ One conclusion from the original section does survive, and it is worth keeping in one sentence: the fixed stack on this truck was too heavy for the truck, and an occasional trailer hid that. ⭐⭐ What changed is that the trailer stopped being occasional — a capacity disguise became a capacity fix the moment it was always attached.
1.10 The tent, and the reason behind it
⚠ HALF RESOLVED, corrected 2026-09-01. The panel half went the way this section argued: a Renogy 200 W portable that gets carried into a clearing. 🔴 The tent half is still open — no tent has been bought and none has been chosen. The 139 lb Smittybilt Gen2 Overlander XL is a planning placeholder, not a purchase, and the decision waits until the rest of the truck is built and weighed. The reasoning below is what the choice will be made against.
The hardshell was chosen for a reason that had not been written down: it is a roof to mount solar panels on. That was a real reason, and it deserved testing rather than assuming — especially since the tent had not yet been bought.
🔴 This project’s own electrical analysis already answered it. Vehicle Power vol 1 concluded: “Under the forest canopy that characterises most of the Upper Peninsula, solar should be treated as a bonus rather than a plan,” and “the DC-DC charger is the primary source, solar is the stationary backup.”
Priced out, the roof-solar plan looks like this:
Table 6 — Priced out, the roof-solar plan looks like this:
| Rooftop tent, planning placeholder | 139 lb |
| (the 120 lb softshell modelled here was optimistic by 19 lb) | |
| Premium paid purely for a mounting surface | 45 lb |
| 200 W of rigid panels on top | ~28 lb |
| Roof-solar package | ~73 lb, carried high |
Against a folding or suitcase panel: roughly the same 28–30 lb of panel, stored low, and — the part that matters under canopy — it can be carried into a clearing and aimed. A roof panel is stuck wherever the truck is parked, and under forest canopy the truck is parked in shade. That is not a 20 percent difference; in shade it is close to total.
⚠ One more thing to check on any hardshell before buying it: where the panels point when the tent is OPEN. The lid becomes part of the tent structure, so panels bolted to it may end up steeply tilted, facing backward, or shaded by the tent fabric — working only when the tent is closed, which is when the truck is usually moving and the alternator is already doing the job.
⭐ Dropping to a softshell was modelled here as returning 45 lb. ⚠ It was worth 26 lb in the event — the 45 assumed a 120 lb softshell against a 165 lb hardshell, and the tent actually bought is 139 lb net. The direction was right and the decision stands; the size of the lever did not survive contact with a real product. → Rooftop Tent vol 2.
1.11 “Just go with it” — what that actually means
It is a fair question and it deserves a straight answer rather than a lecture.
⭐ GVWR is one number covering the worst case: fully loaded, at speed, in summer heat, in an emergency stop, possibly towing. Two-tracks and dirt roads at 25 mph are a much gentler duty cycle, and the number does not know the difference.
⭐ And GVWR is not the physical limit. The axle and tyre ratings are. From this truck’s own label: GAWR front 3,296 lb, rear 3,434 lb, certified with 265/70R17 tyres at 35 psi cold. The worst-case bound earlier in this dive — assuming every pound of payload lands on the rear axle — reached about 3,319 lb, under the rear rating — and that bound is now built on measured axle weights rather than an assumed split.
🔴 So it is entirely possible to be over GVWR and still inside both axle ratings and both tyre ratings. That is a materially different risk picture from “overloaded and about to fail,” and it is the honest reason “just go with it” is more defensible than it sounds.
What it still costs, stated plainly:
- Braking distance grows. The brakes were sized for GVWR, and this is the one effect that does not care how gentle the terrain is.
- ⚠ The risk case is the highway run to the Upper Peninsula, not the two-track. Heat, speed, and a panic stop are where payload matters. Gravel at 25 mph is not.
- Liability and insurance exposure if the truck is over in a crash, and warranty exposure on driveline and suspension.
- Component life — bearings, springs, tyres — shortens gradually rather than failing suddenly.
1.12 The recommendation
🔴 Weigh it. One scale ticket, front and rear axle, loaded as you actually drive it.
⭐ That single measurement converts “assume it’s fine” into “know it’s fine.” If both axles are inside their ratings, “go with it on two-tracks and pack lighter for the highway” becomes an informed engineering decision rather than a hope. If an axle is over, that is a different conversation and you will want to know before a tyre tells you.
✅ The XTR3 has now been weighed: 115 lb, not the 150 lb estimated. The estimate was 30 percent high, and the project had been carrying a 35 lb phantom since the rack was first budgeted. ⭐ That is the whole argument for measuring rather than estimating, in one line — and it is the same lesson the payload figure taught, arriving from the other direction: the estimate was pessimistic this time, and it was still wrong.
⚠ The figures in this paragraph are superseded. On the always-a-trailer footing, truck items stand at 974 lb and the coupled truck lands at 1,075.5 lb — 24.5 lb under the label. The generated table at the top of this page carries the live numbers.
Then decide the tent with real numbers in hand, and with the solar question settled on its merits rather than as a given.
🔴 NOT DECIDED — corrected 2026-09-01. An earlier version of this paragraph said the tent had been decided as a 139 lb Smittybilt Gen2 Overlander XL. It has not been bought and it has not been chosen. The owner is deferring it until the rest of the truck is built and weighed, which is the right order: it is the last big variable, and every other number it has to fit around is now measured. Candidates run from about 90 lb to over 170 — an 80 lb spread, wider than any other open item in the budget. ⭐ The bedding that lives in the tent is separately counted at 8 lb, a sheet and two light bags, once the king-bedding assumption was replaced and the double-count removed.
⭐ Where that leaves the build: with a trailer always coupled the truck is 24.5 lb under the label, and the open problem is the tongue at 8.50 percent against a 10 percent floor. → vol 3. ⭐ The number got worse before it got better, because most of what was added had always been aboard and simply had never been on the list: running boards, the hitch, a compressor kit. The estimate was the error. ⭐⭐ And the tent is now unblocked — at 974 lb of truck items it no longer has to be the lightest one available, so it can be chosen on room, deployment geometry and the CPAP. → Rooftop Tent vols 2–3.
1.13 Where the detail lives
- Bed Rack and Awning vol 4 — the full truck-side budget and the levers, item by item
- Trailer Build vol 1 — the trailer as built, and the tongue arithmetic
- Trailer Build vol 2 — the 80/20 rail as a trim control, and how consumables shift it
- Trailer Build vol 3 — where the tongue-weight window comes from, from first principles
- Trailer Build vol 4 — how to weigh it, and why the usual scales do not fit
- Suspension and Armor vol 5 — why springs and shocks cannot raise any of these limits
- Tires and Wheels — load ratings against the measured axle weights
- Rooftop Tent — the hardshell decision and what it consumed
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