So, here's my .02¢, my "dually" started life as a SRW and my guess is it was converted to a DRW by centurion/Lehman. It has these annoying extension things that are a pain in the butt to get off so you can work on your brakes and very possibly are the reason that the inner wheel bearings were screwed when I got it, but that's another story. I'd get a real dual wheel axle and front hubs.
I know where a dually 3:55 is, but I want a 4wd transmission and transfer case before I go that route so I can put it in low for reverse.
And now the hyjack: the fenders for dual wheels are referred to as "the butt" of the truck at my house, so when I park in a parking spot that my truck doesn't pull all the way into we say "your butt's hanging out of the parking spot". Thus when I figured out that my truck had been modified, my wife began to refer to it as my trucks "augmented butt", so you'll have to live with that tag like I do.