Individually spring-loaded (6) moldings (5) adjoin one another over the loading surface of a vehicle so as to adjoin the saddle of the coil troughs (1) at a load compatible distance from the center axis of the vehicle located by bearings. The moldings come in propeller form and are restricted in travel by an endstop (7). When out of load, the moldings lie proud of the loading surface and are placed at a 90 deg angle to the vehicle axis specified.