A system is for displaceable mounting of outboard utility equipment to a vehicle for selective in situ access to a utility compartment of the vehicle includes a first portion that may be detachably fixed to the vehicle. The first portion includes a main support frame defining an access opening for unimpeded access to the utility compartment, and a hitch receiver defining a tow hitch receptacle for auxiliary equipment. A second portion is displaceably coupled to the first portion for displacement between open and closed positions relative thereto. The second portion in the closed position extends across at least a portion of the access opening and in the open position remains displaced to permit unobstructed access to the utility compartment through the access opening. The second portion includes a gate assembly to which the outboard utility equipment is attached. A latching structure releasably locks the second portion in the closed position.

In the case of a trailer coupling comprising a ball neck which can be moved between a working position and a rest position and which 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 means 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, in order to create the simplest structural and safest solution possible, it is proposed to provide a multiple blocking device, which comprises a blocking body which can 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.

In order to improve holding device that is mountable on a rear region of a body of a motor vehicle, comprising a pivotal bearing unit, which is mountable in a manner fixed to the vehicle on the rear region of the motor vehicle, in particular a passenger car, by a carrier unit, and on which a pivot element that carries an attachment element is mounted to pivot about a pivot axis running transversely, in particular obliquely, to a longitudinal center plane and is thus pivotal from a working position to a rest position and vice versa, wherein by way of a connection arm the pivot element is provided with an attachment element carrier that has an insertion receptacle and in which the attachment element is insertable and fixable with positive engagement by an end region, wherein in the working position the insertion receptacle extends with its center axis substantially parallel to the longitudinal center plane, and wherein the attachment element carrier comprises a receiving body that has an insertion receptacle, the improvement being such that the connection arm is provided with a holding arm that is connected to the receiving body.

In order to improve a trailer coupling, comprising a ball neck, which is movable between a working position and a rest position and which is connected at a first end to a pivot bearing unit and carries a coupling ball at a second end, wherein the ball neck is pivotable by means of the pivot bearing unit about a pivot axis between the working position and the rest position in order to execute a pivoting movement, and a rotation blocking device acting between a guide body and a pivot bearing body of the pivot bearing unit and having at least two rotation blocking units, each of which has a rotation blocking body, which is guided movably in a guide direction by means 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, in such a way that it realizes an easy-to-implement securing of the actuating body in the rotation blocking positions, it is proposed that a blocking device is provided which comprises a blocking body which is movable into a securing position securing the actuating body in the rotation blocking positions and a standby position lying outside the securing position.

In a trailer coupling, in order to detect the rest position and/or the operating position by means of an unambiguous signal, it is proposed that a detector unit is associated with the rest position locking device, said detector unit detecting at least one active position of the rest position locking device.