I run this thing in rocks trees willows these rails have kept the jeep looking decent. The 3/16 is denting and gougeing from rocks but makes hard stuff easy because i just slide over rocks and pivot off them around trees. The fenders just cover 35x12.5 on 3.75 bs 15x8 wheels. It would be some kinda bad dream to go back to wherling without fenders and sliders. Nearly un bearable in wet conditions