The Kwikee single step is the ideal step for motor homes, vans, and pickups where there is 12" to 19" of clearance from the mounting surface to the ground. It provides firm, under foot support for easy vehicle access. Series 33 - Vans. 29-1/4" frame width, 28" tread width, 15-19" mounting surface to ground, 7-5/8" tread drop from mounting frame surface.