In regards to body lifts, I'm not a fan of anything over 1", but I know a lot of people run 3" body lifts with no problem. In general the longer and flatter the springs are at rest the more travel they can offer. If money isn't a major concern I would get Alcan or AOR Orbit Eye springs and have the front springs made to locate the axle forward of the stock position then you wont have to use as tall a spring.......I have 5" alcan springs that locate the front axle foward as well as an All Pro front spring hanger that moves the axle forward and I run 37" Goodyear MTRS with no problems.....but I also have bump stops that don't let my front springs go past flat.....they can't negative arch. If you are looking for all out travel then I'll have to have to talk to someone else....my rig is a daily driver that is still very capable off road. So I don't mind giving up some travel for better on road capabilities. Hope I made some sense. Good Luck