got a really nice response from RCV on the subject:
Looks like Currie 9" is the best choice to go with, along with RCV CVs and Axles.
Oh, and Im not going to be doing this anytime soon, this is just out of curiosity. However, if I do decide to do something extravagant down the road to my truck, it would definitely be center mount 4x4 and links. No dirty hooker travel or twin traction beams for me