In order to improve a trailer coupling for motor vehicles comprising a ball neck, which is mountable at a first end on a rear part of a motor vehicle to be fixed to the vehicle by means of a ball neck holder and which carries a coupling ball at a second end, in such a manner that load carriers can be mounted and securely held in a simple manner, it is proposed that at least one positioning body is arranged on the ball neck at a defined spacing from the coupling ball to position a load carrier holding arrangement attachable to the coupling ball and the ball neck.