Device for transporting a load on motor vehicles comprising: - a connection element connectable to a towing hook installed on a motor vehicle, - a fixed frame connected to the connection element, - a mobile frame, assembled sliding on the fixed frame, on which the load is adapted to be fastened; - first locking elements associated with the fixed frame and with the mobile frame and adapted to block the translation of the mobile frame with respect to the fixed frame in a position next to the towing hook, characterized in that there are provided - second locking elements associated with the fixed frame and with the mobile frame and adapted to block the translation of the mobile frame with respect to the fixed frame in at least one intermediate position between the position next to the towing hook, in which the first locking elements block the translation of the mobile frame with respect to the fixed frame, and a final position, in which the mobile frame is moved away from the towing hook, said mobile frame being adapted to slide on the fixed frame between the position next to the towing hook and the at least one intermediate position, and being adapted to be inclined rotating around an oscillation axis transverse to the sliding direction of the mobile frame on the fixed frame after having passed the at least one intermediate position, whereby locking elements and the second locking elements are adapted to prevent the translation of the mobile frame outwards, moving from the position next to the towing hook towards the at least one intermediate position, or from the last intermediate position to the final position, and are adapted to let free the translation towards the towing hook, in particular from the final position towards the last intermediate position, or from the first intermediate position towards the position next to the towing hook, the first locking elements and the second locking elements being each composed of a tooth and of a first seat or of a second seat obtained in the fixed frame, said tooth being hinged inside the mobile frame and adapted to be engaged in the seats (25a, 25b) blocking the movement of the mobile frame. - a connection element connectable to a towing hook installed on a motor vehicle, - a fixed frame connected to the connection element, - a mobile frame, assembled sliding on the fixed frame, on which the load is adapted to be fastened; - first locking elements associated with the fixed frame and with the mobile frame and adapted to block the translation of the mobile frame with respect to the fixed frame in a position next to the towing hook, characterized in that there are provided - second locking elements associated with the fixed frame and with the mobile frame and adapted to block the translation of the mobile frame with respect to the fixed frame in at least one intermediate position between the position next to the towing hook, in which the first locking elements block the translation of the mobile frame with respect to the fixed frame, and a final position, in which the mobile frame is moved away from the towing hook, said mobile frame being adapted to slide on the fixed frame between the position next to the towing hook and the at least one intermediate position, and being adapted to be inclined rotating around an oscillation axis transverse to the sliding direction of the mobile frame on the fixed frame after having passed the at least one intermediate position,