I took my Jeep in to a tire shop this week to have a screw removed from my front passenger tire. I am running 35" Cooper Discovery, E load on 17" rims. The owner of the shop told me under no circumstances should I be running below 40#'s pressure. When I ran Yankee Hill I was at about 25#'s and had been driving on that for 2 months. He told me I should not air down at all. Everything I have read, and everyone I have talked to disagree with his advice. He currently has me at 42#'s, and it is a rough ride. I have a 2010 JK with a 3" lift. I apologize if I have used the wrong terminology, this is all very new to me. Any advice is appreciated.