Question in the round: the mass of the campers is built on vans from Fiat, Citroen, Peugeot and Benz. In our van, the maximum permissible weight of 3500 kg, the manufacturer gives an air pressure of 5 bar around. It is easy to drive, but quite uncomfortable. If you have something to do with the matter, you will find tables by the tyre manufacturer, in which air pressures for different axle loads are specified. In our case the maximum axle load with front 2100 kg and 2400 kg in the rear. I weighed the vehicle fully loaded, total weight 3500 kg, axle front 1660 kg, axle rear 1840 kg. From the table for the Conti GJR mounted with us, this results in an air pressure of 3.1 bar in front and 3.3 bar in the rear. Is it safe to lower the air pressure by 2 bar in order to increase the ride comfort? In percentage terms, this is a powerful deviation from the vehicle manufacturer’s specification, since one comes after all On the other hand, the tyre manufacturer should also know how to operate its tyres.