If you want rock sliders you can bounce off of big rocks day after day, wheeling trip after wheeling trip, you'll care as much about what they're made of as what they're mounted to. That is why we mount these off of the frame and recommend *welding* them to the frame -- because unlike bolts, welds don't back out and come loose after vibrations or boulders.
These are made from a combination of 2" DOM Round Tube (120 wall) and 1/4"+3/16" laser cut steel plate that is CNC formed. The 3/16" laser cut steel plate that spans the distance between the 2 structural tubes is designed with minimal rock catching cutouts -- to provide a strong smooth surface that will slide over rocks and obstacles. The DOM Tubing can be supplemented with an aluminum insert for strength. Inserts are made of 1.75" OD (0.250 wall) 6061 Aluminum Tubing, and increase the effective wall thickness of the rock sliders 2" DOM runners.
Due to the gussets/reinforcements that prevent unwanted flex of the rock sliders, 4 small notches for clearance (using a cut and fold method) are required in the JLU pinch seam.