[Donjamin]

I have an Air Lift 7500 system on my F-250. The truck has the Ford trailer suspension so my ride is stiff to begin with. I run 15 empty and take it up to 50 psi before I hitch up the trailer. With the trailer hitched and sitting on the truck - the PSI guage shows 80-85 PSI. For me, that amount gives us a very smooth ride.