Hi, I recently purchased a 17 4WD Yukon. It's a SLT and has no air ride. I want to put a 2/3 on it, maybe a 2/4. I was looking at the max trac springs that include the shock extenders. Any thoughts on those? Rough ride, too soft, etc? I believe the springs are the same on both 2wd and 4wd. That kind of surprised me. What do you guys think?