The removable 2GÇ¥ Square Receiver Tube features the traditional 2GÇ¥x2GÇ¥ square receiver tube adapter designed for Class II towing (up to 3,500 lbs). Click on attachment feature for ease of removal from the vehicle and keyed locking mechanism to deter theft. Includes: BMW Rear Transport Class II 2GÇ¥ Square Receiver Tube. Rear Transport Crossbeam (Required). Rear Transport Trailer Lighting Module (Required for towing). Rear Transport Trailer Wiring Harness (required for towing).