The dually can obviously handle more pin weight than a SRW. The SRW gets better fuel economy - especially with Ford where the duals dictate the rear axle ratio- SRW can be purchased with a short box which makes it a little nicer to drive in the city. SRW has better traction in snow and mud. As for price of the truck - a loaded King Ranch dually will save you about three hundred dollars as compared to a loaded King Ranch SRW short box - the 20" wheels are more expensive than going to the 6 smaller wheels but the fuel savings of the SRW will offset that cost in little time. In your case a SRW should do just fine. I would stick to a SRW for the pin weight your talking. I should be using a dually for my gooseneck trailer but because I just hate the thought of driving a dually around without a trailer hooked I am much happier overall with a SRW. Maybe its more about image than anything else.