rock skis
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You can use anything from 4"x4" angle iron, for max clearance to 2x6 box, 2x4 box or what I think looks the best 4x4 box. I have done them all, but mostly do the 4x4. If you blend it in, it looks stock to the average person. its all in what you want. the 2x6 sticks out a little, and aids as a step, or do like this and weld a step on the box tubing.