The MaxxHaul dual hitch extension converts a single receiver to two receivers and allows you to tow a trailer and still use your hitch-mount bike rack, cargo carrier or other hitch-mount accessories. Great for vacations or long road trips. Heavy-duty steel construction. Fits 2" x 2" standard hitch receivers. Extends your receiver by 12" long. Top receiver has 400-lb. capacity. Lower receiver has 4,000-lb. capacity. Top receiver is designed only for accessories.