Nobody likes a bumpy, rocky ride. The CURT- Air Ride- Pin Box allows you to tow and ride comfortably with its shock absorption technology that keeps you calm, collected, and cushioned. - Replaces Lippert 1621 and 1621HD long-jaw 5th wheel pin boxes - Reduces chucking, bouncing and jarring with an internal air bag and built-in strut that absorbs road shock and vibration - Bolt-on installation with no assembly required - Steel construction and black powder coat finish that protect against rust - 21,000-lb. towing capacity - Made in the USA