I believe TBear was referring to the AirLift Ride Control bags and not their Firestone bellow-type bags. The Firestone bags DO lift the rear end and can handle up to 100psi. I installed my RideRite kit with Firestone bags a couple of months ago and am towing my boat with them for the first time this weekend! I can't wait to see how much better my truck sits with the bags installed while towing. IMHO there is no better way to handle the sagging rear.

 

i have the airlift kit on my truck and i love it. i usually run about 50 psi when i hook my boat up. it will add about 2 inches to the overall height in the rear if the bags are pumped up and the truck is empty. not only does it help with sagging, it also smooths out the ride when the trailer is connected. i also opted to run the in cab gauge and compressor. makes fine tuning the set up much easier when everything is connected.