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The Sierra All-Terrain rolls on a 5-inch-wider track (73 inches) than the production version, thanks mostly to its extended-length front control arms and wider-than stock tires. The redesigned grille and cowl-induction hood optimize airflow to the 397hp 6.6L Duramax, and those things on the rocker panels that look like rock rails are actually motorized deployable side steps to aid ingress and egress. Dual tow hooks protrude from the streamlined front bumper, headlamps, fog lamps and turn signals are all high-intensity LEDs, and oversized fender flares cover the 35-inch mud-terrains.