Brakes for land vehicles; clutches for land vehicles; brake cylinders; automatic power steering systems, namely, steering units for land vehicles and parts thereof; automatic guided vehicles; automatic guided vehicle systems consisting primarily of motors, motor controllers, brakes and electric steering systems for fork lift and wire guided trucks; tool storage equipment for vehicles, namely, tool storage bins, boxes and chests especially adapted to fit on or in truck bodies; truck bed storage organizers; roof racks; ladder racks for vehicles; brake retarders, namely, supplemental braking systems for vehicles