Hey X, I have an all-spring lift for a 3/4 ton truck. It will sag an inch or two maybe, but those lift springs don't really sag any. Just go and tie on to something and see what it does.xanthias said:OT: Hey, MG, when you tow with your SuperDuty, do you have any kind of supplemental air bags in the back to level you when towing? Is your ProComp lift all-spring? How's the rear sag in towing?