The invention relates to a trailer coupling including a ball neck, which is movable between an operative position and a rest position and which has a coupling ball, a pivot bearing unit, which is arranged fixed to the vehicle, and a rotation blocking arrangement having at least two rotation blocking bodies, which are guided by means of a guide body to be movable in a guide direction having at least one component in the radial direction relative to the pivot axis, and having an actuating body which has a respective cam face, that runs transversely to the guide direction, for each of the rotation blocking bodies and which is arranged to be rotatable about the pivot axis and as a result of the rotary movement whereof in a direction of actuation the at least two rotation blocking bodies are movable and urgeable in the guide direction, wherein a release position latching arrangement is provided which, in a release position of the actuating body, is movable between a latch release position that allows movement of the actuating body in relation to the guide body and a latching position that fixes the actuating body in relation to the guide body, and which is urged in the direction of the latching position by a spring element, at least in the release position of the actuating body.