Payload Maths for Van Buyers: Why the Brochure Figure Is Only Half the Story

Payload is the number that sells vans. It is also the number most buyers get wrong. A brochure might promise 1,200kg, but by the time you have added a driver, a mate, a full tank, ply lining, racking, a roof rack and a load bay full of tools, the legal margin can be a lot thinner. In 2026, with model ranges more complicated than ever, it pays to do the sums before you sign.

The three figures that matter

Gross vehicle weight, or GVW, is the maximum the van can weigh when it is fully loaded. You will also see it called maximum authorised mass, or MAM. Kerb weight is the van with fluids and standard kit, usually without a driver or payload. Payload is simply GVW minus kerb weight. That sounds easy. The trouble is that brochure kerb weights are often for a basic model, and the actual van on the forecourt may have options, a tow bar, bigger wheels or a conversion that add weight before you put anything in the back. The VIN plate is the authority. It shows the GVW and axle limits for that vehicle. The V5C can help too, but the plate is what DVSA and the police will look at.

Where the weight goes before your first tool

Take a common 3,200kg GVW panel van with a kerb weight of 2,050kg. That leaves 1,150kg of payload on paper. Now add a driver at 85kg, a second person at 85kg and a full 80-litre diesel tank at about 67kg. You are already at 237kg. Add ply lining and a bulkhead at 70kg, racking at 120kg, a roof rack and ladder at 45kg, tools and a toolbox at 300kg and materials at 150kg. That is another 685kg. Total added weight: 922kg. Your legal payload has dropped to about 228kg. Put a third person in and a generator in the back and you are close to the limit before you have picked up the first job of the day. This is the payload trap. The van is not overloaded because you are careless. It is overloaded because the brochure figure was never a real-world figure.

Options, conversions and crew cabs

Anything that is not standard adds mass. A crew cab carries seats and belts, and often has a lower payload than the panel van it is based on. Four-wheel drive, automatic gearboxes, long-wheelbase bodies, bigger wheels, tow bars, roof racks, bespoke racking, welfare conversions and refrigeration units all eat into the margin. If you are buying a converted van, ask for the revised payload figure in writing. Do not assume the base vehicle's number still applies. The same goes for motorhomes and camper conversions, though that is a different end of the market. For a work van, the question is simple: what does this exact vehicle weigh, and what is left for me?

Axle limits are part of the puzzle

GVW is not the only limit. Each axle has a maximum load, and a van can be legal on total weight but over on the rear axle. Heavy toolboxes at the back doors, a full rack of pipework or a tail-lift can put a lot of weight behind the rear axle. That affects steering, braking and stability. If you carry heavy kit regularly, get the van weighed at a public weighbridge with your normal load on board. Ask for axle weights, not just the total. It costs very little and it tells you more than any brochure. If you tow, check the gross train weight and the nose weight limit as well. A van that is fine solo can be outside its limits with a trailer and a loaded bed.

What running overweight actually does

An overloaded van does not stop as well, does not steer as well, and puts extra stress on tyres, suspension, brakes and the clutch. It can also invalidate insurance if the vehicle is not roadworthy or is being used outside its legal limits. DVSA can stop vans, direct them to a weighbridge and issue prohibitions or fines. In a serious incident, the weights will be part of the investigation. Even if you never get stopped, you are shortening the life of the van and making it less pleasant to drive. The fix is not to ignore the plate. The fix is to buy the right van or to cut the weight.

A simple buying checklist

• Find the GVW and kerb weight for the exact vehicle, not the base model. The VIN plate is the best source.
• Work out payload as GVW minus kerb weight, then subtract driver, passengers, fuel, racking, ply lining, tools, materials and any roof load.
• Leave a margin of at least 10 to 15 per cent for the days when the job needs more kit.
• Check the rear axle limit if you carry heavy tools or materials at the back.
• Weigh the loaded van at a public weighbridge and keep the ticket.
• Ask for the revised payload if the van has a conversion, racking or a crew cab.
• If you tow, check gross train weight and nose weight.
• Consider lighter racking, moving weight forward and taking out kit you do not need every day.

The right van is not the one with the biggest brochure payload. It is the one that stays legal and comfortable on your heaviest normal day. Buy for that day, not for the best-case day.