Distance From Front Bolt Holes to King Pin on Trailair Flex Air # LC328492

Question:

The critical distance I care about for this question is the distance between the front bolt holes center and the King pin center of the Flex Air pin box model 328492 Long Jaw. I currently have the 1621 pin box, on a 2018 F-350 superduty using the factory OEM 5th wheel kit, and a Reese Elite 26.5 hitch. I need to be aligned almost perfectly when hitching given the short distance between the edge of the tailgate and the camper about 3 inches, so losing any length would be an issue. The 1621 distance is 17.75inch from king pin center to first holes center. Cant find any detailed drawings on Lipperts website to determine this measurement on the Flex Air. Can you provide this measurement? Thanks

asked by: Brian

Expert Reply:

The Trailair Air Ride 5th Wheel Pin Box # LC328492 that you referenced, which is confirmed to work with the Lippert 1621 pin box on your trailer, features a distance of 21-1/2 inches from the center of the front row of bolts to the center of the king pin. I have attached an image to assist.

This replacement pin box will do a great job of reducing chucking and absorbing road shock with its internal air bag and built-in strut. I have attached a short video demonstration on this product that you can also check out.

expert reply by: Chris R