I just ordered a book from Amazon, title "No Driver Damage", about the RV transport biz (I'm thinking of getting into that game when I retire in a few years).
Reading the sample pages ("Look Inside" link), there's a sample page or two on advantages/disadvantages of DRW from the perspective of a guy who's done a lot of RV hauling. Have a look -- it's an interesting read.
Short story, as I recall, is he lists one DRW advantage and 8-10 disadvantages, many of which I wouldn't have thought of. A few of the disadvantages apply only to commercial hauling, but most are more generally applicable.
So now I'm rethinking my impending truck purchase (looking at 2014 F350 or RAM 3500, which should still be new enough to lease on for RV transport when I retire). I was pretty solidly in the DRW camp, primarily for possible improved ride/stability and improved safety margin in case of a rear tire blowout. I may still go with the DRW, but after reading about the disadvantages it's no longer a slam-dunk no-brainer choice.
I'm eager to read the rest of the book when it arrives next week.