I have a 4" superlift. the rear end is way to soft. with a load in the truck the rear end drops at least three inches. when I push down on the bumper the suspension will cycle about three times before it stops. Horrible ride on hwy during bumps in a curve or accelerating while passing. truck rocks violently side to side. My question is since the superlift 4" lift springs are not up to the task, what are my options? Do any other manufacturers make stiffer rear coils than the superlift. Finally after searching many threads I can't find an answer about air bagging lifted coils. I cant find a company that makes spacers and I don't understand how the bags could work if they are shorter than the coil spring?