Our fifth wheel's GVWR is 13,990 and our pin weight hovers around 3,000 - 3,100 lbs. We moved up to a DRW to avoid being at, or just above, the rear axle weight rating on the truck. It's nice not to have to worry about what we put in the basement or front closet.
Our 2012 F350 6.7 doesn't have a true exhaust brake, but with the truck in tow/haul mode, the diesel does a good job of controlling downhill speeds. I rarely have to touch the brakes - and that only when the grade is above 6%.
Our current truck has a 3.73 limited-slip rear end. The previous truck was geared taller. With diesels, both were/are great tow vehicles.
Rob
