Look for cracks in your longitudinal frame rails, in and around spring mounts, both front and rear, both sides and above the axles. Hopefully you will not find any, but I saw a you tube video of a guy rebuilding a Roxor from the ground up, and had one rear corner lower than the other, and thought it was a weak spring pack, so he swapped springs from side to side and same corner remained low, which ruled out the weak spring theory. He continued looking and found cracked frame over the rear axle on the low side.