How To Determine The Correct PSI For A Trailair Air Ride Pin Box For A Smoother Ride

Updated 05/13/2022 | Published 05/02/2022

Question:

Great smooth ride, but…. When towing my fifth wheel it rocks side to side? Too mich air in air bag, maybe not enough air? Have a 9,000# fifth wheel 2,100# pinweight. 45# of air in bag of pin box. No yellow sticker on shock for hight reference? 2019 puma 257 ress.

asked by: Al

Helpful Expert Reply:

Lippert removed the old sticker gauge from their Trailair Air Ride pin boxes # LC158778 because they were receiving a lot of complaints about it not matching up with the smoothest ride depending on the trailer. Since the pressure needed for the air bag is dependent on the pin weight, and that can vastly change depending on the trailer and what you have loaded in it, there isn't really a good catch all psi setting.

Lippert's new recommendation is to keep the air bag between 20-120psi and to start out around 30-35psi and increase the pressure in increments of 5psi until you feel like it's a more comfortable ride.

In your case I believe adding more pressure will help stiffen if up the air bag and help counteract the side to side play you've been experiencing.

expert reply by: Kevin C