Large vehicles need a real workhorse to help them gallop on down the road. Workhorse Custom Chassis manufactures heavy-duty chassis for motor homes, buses, and commercial vehicles (primarily walk-in trucks and step-vans) for such customers as UPS. The company also offers parts including steering and suspension kits. Workhorse is the only RV chassis manufacturer to develop a dealership service network so customers can get both chassis and coach warranty service done at a single location. Workhorse Custom Chassis is owned by Navistar International.