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If i understand correctly, i wouldnt be switching out the spring with bags, i would be running both. i know not legally, i just need to get about 600lbs. i understand that a 2500 would be perfect, and if im stuck with what i am at, then ill keep hauling 200gallons, but if bags can help me get 600 lbs then i would want to buy them.
once again, there is noting you can do to increase payload except buy another truck. nothing you add does anything for the payload capacity of the truck. all it does it help the truck handle the load better. air bags are barely adequate for people within the payload capacity for these trucks, hence why i/we suggest you change the springs and add the bags. past that, the tires are your next weakest link.