Yea I totally understand your concern. I'd check it all out first maybe someone here has 37's with glass fenders on mid perch I've been on top perch for a little over a year now with about 17,000 miles on top perch and I'd say a good 1,500 of this were beating it hard off road and maybe another 800 just playing in the dirt a little here and there. Now I've heard that having aftermarket UCA's make a difference cause I noticed my front end dropped a little bit after I put the RPG 1.5"race line UCA's on. They have actual race bearings and not a polyurethane bushing so it allows it to settle a little more so that could be why I haven't had any problems yet.