Most vans run on commercial tyres, marked with a C after the wheel size, as in 215/65 R16C. They have stronger casings to carry heavier loads, and they run at higher pressures than car tyres.
Van tyres often show two load indexes, such as 109/107. The first is the load per tyre on a single wheel, the second the load per tyre when wheels are fitted in pairs on a twin-wheel axle. A replacement must match or beat the load figures of the original tyres.
Fitting a car tyre to a van to save money is a false economy, as it can be overloaded on the first full working day. The same 1.6 mm minimum tread applies to vans up to 3,500 kg as to cars.