I am always amazed that no one ever mentions the fact that with a DRW you have redundant tires on each rear axle. With a nail (or whatever) in one of the duals you carefully drive on the one that is not going flat until you get somewhere to safely change the flat. With SRW you pull over where ever you are at the time. This can often be interesting at best, and often nasty, and sometimes in an unfriendly ditch. With my 41 ft. TH there is seldom adequate room on the side of the road to safely change a truck tire. At least half the time I am on roads with no place to pull over for miles and miles. I would much rather limp into the next truck stop and deal with it there. I guess if some of the advocates of SRW are right that a single tire is just as stable as a dual- then maybe you wouldn't even notice! I think not!
The other issue is that the duals are definitely clumsy off road. More so than the same truck with SRW one ton but that truck is also clumsy as hell compared to a Jeep or similar vehicle. Long wheel base is great for towing but not for off-roading.
None of the one ton diesel trucks are good in the mud cuz of the too heavy front end. Get the DRW and pull just about anything safely and get the bike for the dirt.