Could you put a couple of airbags on your rear suspension to level the truck if had a little bit of sag. In my particularr case, I wouldn't want to add any more leaves to the springs or go with a longer shackle (I have a shackle flip in the rear). Would the addition of some airbags give the extra lift and maybe make it ride smoother? I really don't know if it would even be worth the time and money to do something like this. Thoughts?