Designed for Falcon and Sterling tow bars BUT can fit any 2″ square receiver. The 4″ & 6″ High- Low Drops allow your towing system to be connected at a safe level height. The 12″ EXTENSION extends the receiver 12″. Only for towing a car behind a motor home. Not for use with any type of trailer. All are 6,000 lb. GVWR and 100 lb. tongue weight.