TrailAir Pinbox and 5th Wheel Hitch Not Level Causing Rough Ride

Updated 05/11/2020 | Published 05/09/2020

Question:

I have a trailair on a 34ik cedar creek. I try diddernt air pressure on hitch and I can not get a good ride. The truck and trailer jump evry time I go over a bump or bridge. The truck is so rough it want to throw you out seat. When trailer hook up to truck the 5th wheel hitch and box not flat. If there anything I can do please let me know. About ready to take off rv

asked by: Dennis R

Expert Reply:

If lowering the PSI on your Trailair Air Ride 5th Wheel Pin Box # LC158778 isn't working, it sounds like you need to make some height adjustments to the 5th wheel hitch, the Trailair FlexAir pinbox, or both, in order to level them out.

To do this, park the truck and trailer on level ground. Using the landing gear/jacks on the 5th wheel to make it level, measure from the ground to the bottom of the pin box skid plate (not the king pin), and record the measurement. Then, measure from the ground to the top of the skid plate on the 5th wheel hitch and record it. Subtract the second measurement from the first for the proper height setting.

I'm not sure which 5th wheel hitch you have or on which truck, but most 5th wheel hitches can be adjusted vertically, so I recommend you start by adjusting the hitch height to get the measurements as close to the same as you can. There should also be 5-6" of clearance between the trailer loft and the top of the bed rails as well. I've attached our help article which includes pictures for you at the bottom of this page.

If the trailer is being towed nose up, the hitch weight will be too low and can lead to ride problems with the truck, bad trailer sway, and tracking problems with the trailer. If it is too low it can weigh the rear of the truck down and cause the front to raise up and lead to handling and braking problems and the trailer could also sway since less weight will be on the axles.

expert reply by: Carla M