2011 XLT 4x4. Judging by the door code (11kk), looks like I have #1 torsion bars, which I understand are the stiffest. Like I said, it's level now, but I'm looking at getting a fiberglass canopy which is ~150lbs, so I think I am going to put the 1" leveling blocks in, cuz the shell is going to cause the back to droop some. Maybe I'll take a shot at that tomorrow.