In the very slow build up of my truck. Rick and I installed the air bags today, at 40 psi, it raised the rear 4 inches! The stance of the truck is much better.
Look at the salt on the truck's frame. This is after the under coating was retouched and I paid for the $70 under truck wash. Needless to ssay, I got my money back, but that doesn't help the salt they trapped!!! I am pissed!