Drawbar with a support assembly

The invention relates to a trailer coupling (10) for a motor vehicle (F), with a coupling arm (20) for coupling a trailer or a rear load carrier, and with a vehicle mounting bracket (30) that can be fastened or is fastened to the motor vehicle (F) for holding the coupling arm (20) in a use position (G) provided for coupling the trailer or carrying the rear load carrier, and with a support arrangement (11) having at least one cross member (12) and provided for fastening to the rear (H) of the motor vehicle (F), wherein the vehicle mounting bracket (30) comprises a vehicle bracket body (120) that is bolted to the support arrangement (11). In the trailer coupling (10), it is provided that a single screw bolt (140) is provided which clamps a vehicle bracket mounting surface (121) of the vehicle bracket against a first cross member support surface (151), wherein the screw bolt (140) passes through the cross member (12) and a head of the screw bolt or a nut (141) screwed onto the screw bolt (140) is supported on a second cross member support surface (152) of the cross member (12) on its side facing away from the vehicle bracket body (120), and that eccentric to a longitudinal axis (146) of the screw bolt (140) between the vehicle bracket body (120) and the cross member (12) an anti-rotation device is provided which counteracts a rotation of the vehicle bracket body (120) relative to the cross member (12) about the longitudinal axis (146) of the screw bolt (140).