Trailer coupling

A trailer coupling, comprising a ball neck which is moveable between a working position and a rest position, is connected at a first end to a pivot bearing unit and carries a coupling ball at a second end, the ball neck being pivotable about a pivot axis between the working position and the rest position by way of the pivot bearing unit when a pivoting movement is carried out, and a rotation blocking device acting between a guide body and a pivot bearing body of the pivot bearing unit, having on the one hand at least two rotation blocking units, each of which has a rotation blocking body which is guided movably in a guide direction by way of a guide receptacle of the guide body and which is movable in the guide direction by a pushing surface extending transversely to the guide direction and provided on an actuating body, and having on the other hand at least two receptacles, wherein the rotation blocking bodies of all rotation blocking units are configured to be moved and acted upon in the guide direction by a movement of the actuating body in an actuating direction and wherein the rotation blocking bodies of all rotation blocking units are configured to be brought into a rotation blocking position in the working position by a movement in the guide direction and in this position each rotation blocking body comes into engagement with one of the receptacles in each case in order to block a pivoting movement of the pivot bearing body and of the guide body relative to one another about the pivot axis, and is configured to be brought into a release position, and in this position is disengaged from the respective receptacle and releases the relative movement between the pivot bearing body and the guide body, wherein in all intended relative pivot positions between the pivot bearing body and the guide body, including the rest position and excluding the working position, a movement of the actuating body in the actuating direction and consequently also a force-loaded engagement of the rotation blocking bodies of each of the rotation blocking units into one of the receptacles in each case is blocked, wherein a multiple blocking device is provided, which comprises a blocking body which is configured to be moved into a rest position blocking position blocking the pivot bearing body and the guide body relative to each other in the rest position, into a securing position securing the actuating body in the rotation blocking position, and into an intermediate position lying between the rest position blocking position and the securing position.