What is the Air Pressure Setting On a TrailAir Air Ride 5th Wheel King Pin # LC158778

Question:

What is the air pressure setting. On a lipper air ride pin box 21000 lb on a 18000 lb 5 lb wheel

asked by: Darryl

Expert Reply:

According to Lippert there are many factors that can effect air pressure such as the size of the air spring in diameter and height, the pin weight of the trailer, the mechanics of each individual hitch, altitude and air temperature. Lippert has stated that usable air pressures can range from 20 to 120 psi. Therefore a specific air pressure is not recommended. Instead it is recommended to inflate the air bag to maintain a ride height.

To determine the ride height Lippert has indicated on the lower body of the shock absorber, as shown on the included photo, reference points that should line up with the yellow sticker and arrows. Please note that in order to check this alignment the truck and trailer need to be hooked up, and parked on level ground. When they are hooked up, and the hitch is under load, there should be enough air in the bag to open the jaw to a point that the bottom lip of the top shroud on the shock absorber is even with the arrow on the yellow sticker.

I have included a photo showing the ride height recommended alignment location.

expert reply by: Rachael H

click to enlarge

Carter

6/28/2020

since my Trailair 21000 # capacity hitch shock absorber did not come with markers for air pressure, so how much for it to ride comfortably pulling 13000# trailer? I see in your pictures showing this model there is no stickers on the shock absorber. Read your write up about the air pressure setting, very much ambiguous. And before you go bonkers, this is my second Trailair and the first was clearly marked on the absorber and did very well.

Chris R.

7/2/2020

I wish I could provide a specific psi that will work best in your situation, but it's really going to come down to trial and error. Simply fill it up to maintain proper ride height and take it out on a test drive. If you think a little more cushion is needed, add a bit more air.