The bottom drive design saves precious space. Low Riderz™ Side Wheels only take up 6 feet of tunnel length, while using a 24-inch tall brush. Hydraulic drive is standard, or you can upgrade to electric drive with a 1hp wash down rated, stainless steel, electric drive motor and an aluminum gearbox. A shock and spring are used to hold tension on the side of vehicles. Air-operated controls and retracts can be chosen as an upgrade option. The 5° wash angle provides excellent wash coverage on the lowest area of the sides of vehicles from the door handles all the way down to the bottom of the door sills at line speeds of 150 cars per hour or more.