anyone know why these rigs have such a low gvwr? i was tempted to trade-in my SRW mega-cab this weekend for a DRW Megacab but when I looked @ the gvwr on the DRW I was suprised to only see a 600lb difference. . So my SRW is 9900lbs and the DRW is 10500lbs. I would think aside from the additional support from the wheels, essentially both rigs would be able to carry the same amount of payload. Figure the extra wheels and spacers on the dually are probably more then 300lbs so maybe if you are lucky you can squeeze 300lbs additional payload with the DRW. Am I missing something or is this just rediculous? Does anyone know why the Mega Cabs have such low GVWR's versus the quad and single cabs?