Automotive components on portable racks are defined as the following: instrument panels, windshields, metal and plastic gasoline tanks, heater housings, door panels, interior trim, bumper facia, wiring harnesses, sheet metal, body components, engines, driveline components, steering mechanisms, auxiliary motors, and lighting — all with or without expanded plastic donnage. This definition does not include the storage of air bags, tires, and seats on portable racks.