I have the Westin Nerf Bars.
they just mount to the body bolts under the cab and a stabilizing strap that uses a self-tapping screw. They are very strong!! i had a friend stand on one and he is 350lbs!!
Westin has the plastic steps on the top for traction. Got mine at pep-boys for a good price.
Eric
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2001 QC 2500 4x4 bronze W/two tone Driftwood, 24valve HO 6sp. Westin side bars, fender flares, Rancho RSX off-road shocks, Spray on bedliner, Leer shell Painted to match with LED marker lights, Bf Goodrich AT Tires. Bed rug inside shell W/aux marine deep cycle batt for lights, etc. M Brolins' CB mount.
Name of rig is "big bronze Brute"