Go Rhino Dominator Xtreme D1 Running boards with Rocker Panel Mounting Bracket Kit Model D14299TGo Rhino Dominator Xtreme D1 Side Steps with Rocker Panel Mounting Bracket Kit Model D14299T The Go Rhino Dominator D1 is a cab length slider with drop down step designed for both the daily driver and the recreational off roader. The D1 is constructed of powder coated steel tubing that provides slider protection from trail obstacles and road debris along the rocker panel of vehicle. The wide step area and mesh stepping plate allows for easy access in