The tires are rated at 3500 pounds max load and the axle on a SWD truck is rated at 7000 lb. The DRW model has a higher rating because of the combination of two tires on each side increasing the carrying capacity of the axle/truck. The frames and springs have little to do with it once you are over loading the tires/axle. My DRW truck has a 13,200 lb gross vehicle weight and the SRW had an 11,500 lb GVW. You can add helper springs, air bags all you want but it won't increase the vehicle's GVW rating. It will just make it ride level.
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