Out of warranty, the choice is yours. I don't know which region your in, but I would look for a reputable alignment or suspension shop. One that is going to do the repair and not hit you up for stuff that is not needed. Is this lean equal on the entire side of the vehicle, or is it low in front? I would suspect torsion bar(adjustment), or body mount. The rear suspension is leaf spring, I doubt you have a sagging leaf spring and torsion bar on one side of the vehicle.