Payload, MAM and axle limits
Maximum authorised mass (MAM) is the maximum the vehicle is permitted to weigh when loaded. It is also called gross vehicle weight or permissible maximum weight. The figure is normally shown on the vehicle’s plate or sticker.
Payload is the carrying capacity available within that maximum. It is not the same as load-space volume. A large item may fit physically while making the vehicle too heavy, and a dense load can reach the weight limit before the load bay is full.
Axles also have their own limits. A van can be within its overall maximum and still be incorrectly loaded if too much weight sits over one axle.
Model names and internet specifications are useful for shortlisting, but the exact vehicle plate and manufacturer information are what matter for the derivative you intend to use.
Calculate the load you actually carry
Include more than the obvious stock or materials. A working payload can include:
- the driver and every passenger;
- tools, stock, samples and packaging;
- racking, lining, roof bars and permanently fitted equipment;
- tow bars and accessories;
- items that accumulate in the cab and load area during normal work.
Write down a realistic heavy day rather than an ideal average day. If loads change, use the heavier regular case and keep sensible headroom.
Check the exact derivative
Payload can change between wheelbases, roof heights, engines, trim levels, body conversions and seating configurations. A crew van or tipper cannot be judged from the figure for a basic panel van with the same badge.
Ask for the plated figures on the actual vehicle. The government’s vehicle weights guidance explains MAM, gross train weight and where to find the relevant plate. Drivers and operators should also review the current rules for driving and loading a van.
Choose useful headroom—not only space
If your calculated load sits close to the limit, consider a more suitable derivative rather than relying on perfect packing every day. Extra payload headroom can account for changing jobs, another passenger or equipment added later.
That does not always mean buying the biggest van. A compact Citroën Berlingo may suit lighter urban work, a Ford Transit Custom balances access and capacity, while a full-size Ford Transit offers more options for larger loads. The right answer starts with the actual weight and dimensions of the work.