Dullys are stupid and you want to put what what in his butt?
[ame="http://www.youtube.com/watch?v=fbGkxcY7YFU&feature=youtube_gdata_player"]http://www.youtube.com/watch?v=fbGkxcY7YFU&feature=youtube_gdata_player[/ame]
i have a set of the front dually spacers that bolt on to the front axle to make it a dually axle. and 16.5 hummer rims have beadlocks so you dont have to worry about loosing a bead. and i have a buddy with a 3.54 dually rear axle for sale if you want it.
Get yourself a dually Dana 80, a set of inner 16" dually wheels, spacers for the rear axle, and bolt up your current, or stock, SRW wheels, if also 16's, and be done with it. They look pretty nice setup like that IMO.