The Accelerator™ Horizontal Top Wheel operates with a stainless steel 1-1/2 H.P. electric drive motor and a cast aluminum gearbox, which delivers 90RPM. It includes an 80-inch-wide X 54-inch diameter Star Foam™ brush. The Accelerator™ has a single leg support structure so it can be installed on either the driver side or the passenger side. It delivers excellent coverage on low vehicle front ends and washes midway down the rear of SUV’s at line speeds of 150 cars per hour! The optional open pickup truck bed detector allows the accelerator to wash pickup trucks without dropping into the truck bed. It is so smart it can even detect the difference between an open bed and a tonneau cover!