Wow, don't see much info from TRE owners... I'm not a racer or drive it like I stole it guy. The TRE is not made for that. Here is some solid advice, then let your wallet be your guide.My collars are down enough that the spring is fully compressed, not sure it can go much more. I measure 14 inches of clearance in front and 11.5 in rear with no gear in bed, gets worse with tools and beer. Have not checked the pressure as I had not thought of that.