The fifth wheel coupling is fixed to the tractor frame by means of a mounting plate. Various mounting plate and fifth wheel mounting heights are available to facilitate an accurate match between the height of the fifth wheel and existing trailer systems.

The fifth wheel coupling is built onto either the frame or subframe of the tractor. The JOST mounting instructions for fifth wheel couplings and mounting plates, as well as the respective mounting instructions supplied by the vehicle manufacturer must be observed when mounting or converting equipment.