The heavy-haul business meets its match with Western Star. Our 4900 SA can handle any environment. No frame in the industry stands up to abuse more than Western Star's straight-through 120,000-psi heat-treated, custom-punched, custom-profiled, steel frame. Add to that one of the three available engines choices from Detroit Diesel, Mercedes-Benz and CAT and you'll have the ultimate combination of performance and durability so critical to your business. Drivers give the 4900 SA high marks for its increased payload opportunities and its excellent maneuverability.