Drive Roller for Lift and Transport Trucks An additional electrical drive roller can be installed at the roller track of any lift and transport truck from our HTW 50/xxx and HTW 51/xxx range to automatically put a body tray off the truck onto the shelf. The drive roller is operated through forwards/backwards buttons at the control unit. The power supply is provided by means of the built-in battery. Type: MTR-RB 24V-OFAT