As far as I know, the spindles work with the torsion bars and you have to be 2wd to use them. You can't do them on 4wd vehicles.
Also, getting stiffer bars, like B rated bars are the stiffest besides 1 and 2, will help lift some too. So SOA rear plus spindles, stiffer bars, and TT would help. Or, as a cheaper way, do a sloped body lift. Actually, go search "sloped body lift" when you get the chance.