The bearing load is the mass that rests on the coupling device of the towing vehicle. To determine it, the car driver can place a piece of wood or a pipe underneath the coupling point of the trailer and place a bathroom scale underneath. The bearing load is displayed. The minimum load to be carried by the towing vehicle shall not be less than 4% of the trailer's total weight for trailers with a gross vehicle weight of not more than 3.5 tons. However, a minimum load of 25 kg is sufficient. In this example, the minimum support load is 24 kg. When loading the trailer, you, as a car driver, must be careful not to undercut or exceed the minimum and maximum permitted load. By shifting the load, you can influence the bearing load.