Ineos Grenadier Payload: Why the Rear Axle Runs Out First

The Ineos Grenadier is rated for 1,703 lbs of payload — more than a Defender 110, a Lexus GX 550 or any Wrangler in my database. That is the good news, and it is why the Purist Expedition Crowd loads these things the way they do: spares, tools, a second spare, water for four days, and a rear door full of recovery gear.

Here is the part the brochure leaves out. On a loaded Grenadier, GVWR is not what stops you. The rear axle is. I built Rig-Locker to run axle weight distribution, center of gravity and Static Stability Factor together, because a single payload number hides exactly this kind of problem. Every figure on this page came out of that engine.

The numbers that matter

GVWR	7,716 lb	The legal ceiling for the whole loaded vehicle
Curb weight	6,013 lb	Empty, full tank of fuel already included
OEM payload rating	1,703 lb	GVWR minus curb — before any people
Front GAWR	3,500 lb	Legal limit for the front axle
Rear GAWR	4,216 lb	Legal limit for the rear axle
Track width	65.2 in	Front and rear are the same on this platform
Fuel capacity	23.7 gal	About 149 lb of gasoline at a full fill
Center of gravity height	30.5 in	Estimate — no measured figure has been published for this vehicle
Roof load limit	330 lb	The figure I carry for this vehicle

Your real payload is not 1,703 lbs

Payload includes people. Every occupant is 175 lbs of your rating, and that comes off the top before a single piece of gear goes in the back.

Occupants	Payload left for everything else
Driver only	1,528 lb
Two adults	1,353 lb
Three	1,178 lb
Four	1,003 lb
Five	828 lb

A real loadout, run end to end

This is the same four-person weekend I run on every one of these pages, so you can compare rigs straight across: rooftop tent, recovery gear, a loaded fridge, tools and a compressor, clothing and bedding, 30 gallons of fresh water, 40 lbs of food, and a 5-gallon jerry can on the rear bumper. Gear rides in the back.

Rooftop tent (on the roof)	135 lb
Recovery kit and traction boards	95 lb
Fridge, loaded	75 lb
Tools, spares, air compressor	60 lb
Clothing and bedding	55 lb
Fresh water, 30 gal at 8.34 lb/gal	250 lb
Food	40 lb
Jerry can, 5 gal on the rear bumper	32 lb
Total	742 lb

Available payload with four people aboard: 1,003 lbs. You have 261 lbs to spare.

Four ways the same trip works out

	Payload	Front axle	Rear axle	Safe side slope
Empty, driver only	1,528 lb spare	2,811 / 3,500	3,377 / 4,216	23.4°
Four people, full loadout	261 lb spare	3,259 / 3,500	4,195 / 4,216	23.0°
Same gear, two people	611 lb spare	3,049 / 3,500	4,055 / 4,216	23.1°
Four people, tent off the roof, water cut to 15 gal	521 lb spare	3,186 / 3,500	4,008 / 4,216	23.4°

Look at the four-person row. GVWR says you have 261 lbs to spare. The rear axle says 21. That is 4,195 lbs on a 4,216 lb rated axle, and it happened with an ordinary weekend loadout.

The reason is the weight split. A Grenadier carries 55% of its curb weight on the rear axle before you put anything in it, and almost everything you add — cargo, water, the jerry can, a rear-door carrier — sits at or behind that axle. If you only check GVWR on a Grenadier, you will think you are fine when you are not.

Going from four people to two buys back 350 lbs of payload, but it only moves the rear axle 140 lbs, because people sit ahead of the cargo and most of their weight lands on the front axle. What actually unloads the rear axle is pulling weight out of the very back.

What the stability number is telling you

Static Stability Factor is track width divided by twice the center of gravity height. A Grenadier runs a 65.2 inch track. Nobody has published a measured center of gravity for it, so I carry an estimate of 30.5 inches for a tall, boxy expedition SUV in this class. On that estimate it sits at about 1.07 empty, an ELEVATED reading on NHTSA’s rollover-star break points.

I am telling you it is an estimate because the number matters and I will not dress it up. Treat it as a direction, not a verdict. Loaded as described above, the center of gravity moves from 30.63 to 31.51 inches and safe side slope drops from 23.4° to 23.0°. The rooftop tent is doing a large share of that on its own, because it sits at the roof instead of the floor. If you have had your Grenadier’s center of gravity measured, I want that number.

I report stability as degrees of safe side slope rather than as a raw g figure, because everybody can look at a piece of off-camber trail and estimate a slope. Safe side slope is half the static tip-over angle. That halving is my safety margin, not a published standard.

What I would change on this rig

Watch the rear axle, not just GVWR. Take weight off the very back first: the jerry can, the rear-door carrier, the heavy recovery gear. For the rear axle, moving weight forward of it does more than taking the same weight off the roof.

Water is still the lever. Cutting from 30 to 15 gallons is 125 lbs, nearly all of it on the rear axle. Plan resupply instead of carrying four days of margin.

Do not expect suspension to fix this. Heavier springs and airbags change how the rig sits. They do not raise GVWR or GAWR by one pound.

Weigh it once, axle by axle. Bumpers, sliders, a winch and a roof rack all add to curb weight before you pack. A CAT scale gives you front and rear separately, and on a Grenadier the rear figure is the one that matters.

Run your own numbers

Every figure on this page came out of the free calculator, using the same engine that ships in the app. Pick the Grenadier Fieldmaster from the list, enter your load, and it does the rest. Nothing to install, no account.

Open the payload calculator →

If you want it to remember your rig and your gear list instead of retyping it every trip, that is Rig-Locker Lite, and it is free. If you want per-item placement on a 3-D model of your rig so you can see which weight to move rather than just being told you are over, that is Rig-Locker Pro.

Same math, other rigs: Jeep Wrangler Rubicon · Jeep Gladiator Rubicon · Toyota Land Cruiser 250 · Mercedes Sprinter 2500 AWD. Or run your own on the payload calculator.

Common questions

What is the payload capacity of an Ineos Grenadier?
1,703 lbs on the Fieldmaster — 7,716 lb GVWR minus 6,013 lb curb weight. That is before occupants. With four people aboard you have 1,003 lbs left.

What usually limits a loaded Grenadier first?
The rear axle. With four people and a 742 lb weekend loadout the rear axle reads 4,195 lbs against a 4,216 lb rating while GVWR still shows 261 lbs spare.

What is the Grenadier center of gravity height?
No measured figure has been published. Rig-Locker uses an estimate of 30.5 inches, which puts Static Stability Factor at about 1.07 empty.

How much weight can I put on a Grenadier roof?
The figure I carry is 330 lbs. Roof weight costs more stability than the same weight on the floor, so it is the first place to cut on technical trails.

Does a suspension upgrade increase Grenadier payload?
No. GVWR and GAWR are legal ratings assigned to the vehicle. Suspension changes how it carries a load, not how much it is rated to carry.

Specs are OEM-published, with NHTSA-measured center of gravity where it exists and an estimate where it does not. This is a planning tool, not a substitute for a scale — weigh your rig loaded if you can.

— Brent, AX-Mfg