Fifth Wheel Trailer Hitch Pin Box; Air Ride ™; King Pin Coupler; 21000 Pound Gross Weight Capacity; Long Jaw Air Ride Pin Box; Replaces Lippert 1621 Pin Box Trailair® has been pioneering advanced RV ride solutions for more than a decade. We offer a full line of ride enhancement solutions that fit all budgets and were designed to reduce road shock and vibrations caused by driving on rough roads. As a result, drivers experiences less fatigue while the RV is protected from damage. Type: Air-Ride Coupler Type: King Pin Gross Weight Capacity: 21000 Pound Length: 28-11/16 Inch Width: 12 Inch Bolt Pattern: 2 Row Horizontal Mounting Bolt Spacing: 7-3/4 Inch Vertical Mounting Bolt Spacing: 2 Inch Color/ Finish: Black Powder Coated Material: Steel With King Pin: Yes With King Turret: Yes With King Pin Locking Wedge: Yes With Turret: No With Spacers: No Features & Benefits Gas Shock And Air Bag Combination Absorbs Road Shock And Controls Fore To Aft Coach Movement, Otherwise Known As Chucking Designed To Reduce Road Shock And Vibrations Caused By Driving On Rough Roads Drivers Experiences Less Fatigue While The RV Is Protected From Damage Gives RVers A Better, Smoother Ride Limited 1 Year Warranty