The BMW Towing and Transport System has a unique design and is very easy to use. Class 2 Trailer Tow Rating (3,500 lb max towing capacity and 350 lb max tongue weight). Detachable 2” x 2” square receiver tube adapter that easily snaps into a mount located under the rear bumper cover which eliminates the need to cut through the vehicle’s rear bumper cover. Removable square receiver tube adapter is lockable to deter theft. Discreet but accessible trailer lighting connector. Both 4 and 7 pole trailer lighting connectors. Fits all body variations of the X3 and X4 (including the M Sport Package and X-Line Pro aero kit). Functionally integrated with the vehicle’s exterior lighting system and the DSC (Dynamic Stability Control) system. Automatically immobilizes rear-PDC (Park Distance Control) sensors when a trailer is electrically connected.