This industry comprises establishments primarily engaged in (1) manufacturing motor vehicle bodies and cabs or (2) manufacturing truck, automobile and utility trailers, truck trailer chassis, detachable trailer bodies, and detachable trailer chassis. The products made may be sold separately or may be assembled on purchased chassis and sold as complete vehicles. Motor homes are units where the motor and the living quarters are contained in the same integrated unit, while travel trailers are designed to be towed by a motor unit, such as an automobile or a light truck. Illustrative Examples: Bodies and cabs, truck, manufacturing Camper units, slide-in, for pick-up trucks, manufacturing Pick-up canopies, caps, or covers manufacturing Motor homes, self-contained, assembling on purchased chassis Semi-trailers manufacturing Travel trailers, recreational, manufacturing Establishments primarily engaged in--