Like nerf bars, running boards are designed to provide a sturdy step stool, allowing you to climb into your vehicle with ease. The main difference yielded from nerf bars and running boards is the difference in the tread. The tread section of the average running board tends to be wider and deeper than that of a nerf bar. If your definition of the best side steps for trucks, Jeeps, and SUVs includes traction, strength, ground clearance, and looks, you’ll want to look into running boards.