You all need to go to:
siblingrivalry.com
Those are some B/A duallies. I wanted to do it too, but I don't have the money and I've owned trucks on 44's and bigger (up to 56") and it sucked. Cool to look at though.
The people that operate that website make some parts for lifting duallies too, quality stuff. Its worth a look.
Are you going for mud tires (I assume) or some 22. 5s?
-R. J.