Description:* SAFE Safely supports up to 750 lbs. Thoroughly tested for reliability. Under step light. * STRONG. Heavy gauge steel & durable powder-coated finish. Solid steel drive rods. Stainless steel bushings. Sealed wire connectors. * SMART. Power steps feature automatic shut-down if step strikes obstacle. Logic Control Unit senses operating mode. Last out logic extends step one last time when you turn off ignition. 26 Series Single step: 6.88 thick x 24-1/3 wide with 9-1/2 tread. Total extension: 13-3/4 28 Series Single step: 5.88 thick x 24-1/4 wide with 10-3/8 tread. Total extension: 13-3/8 39 Series Single step: 4.25 thick x 24-3/4 wide with 10-3/8 tread. Total extension: 111/2 32 Series Double step: 7.88 thick x 251/4 wide with 8 tread. Combined riser height: 143/4 23 Series Triple step: 12.30 thick x 261/3 wide with 8 tread. Riser height: 21-1/4 25 Series Triple step: 9.42 thick x 25-1/2 wide with 9 tread. Riser height: 22 Steps for Trailers & 5th Wheels: Steps for trailers and 5th wheels available by special order. Spacer may be required.