Trailer coupling with a coupling arm

The invention relates to a trailer coupling for a motor vehicle, with a coupling arm (), on the free longitudinal end region () of which a coupling body (), in particular a coupling ball (), for the coupling of a trailer () or a load carrier () is arranged, and the other longitudinal end region () of which forms a holding end () for holding and/or movable mounting on a supporting structure () of the motor vehicle (), wherein the coupling arm has supporting straps () which extend along a longitudinal extent of the coupling arm at a transverse distance () to each other between the longitudinal end regions (). It is provided that the supporting straps () are connected to each other by a plurality of connecting struts (-) in the manner of a lattice structure () or rib structure ().