I couldn't find any info either. Few have done it as it is involved ( read=expensive) . So I went into it blind thinking it shouldn't be too hard. It turned out to be a PITA!
I have heard shops charge an arm and a leg for doing conversion.
I have a 4x4 c5500 dump truck that I sourced parts from and I wanted it to be a factory like conversion, with dash switch and all other needed components swaped over. Having all components sitting next to truck was nice and made it easier but I would recomend that if your not wanting to spend a week in the shop you should leave it to the pros.
Frame isn't pre drilled for transfer case mounts, front axle needs different steering components, re-routing of exhaust to clear transfer case, axle perches are wider on 4x4 needing different shackle mounts on one side, transfer case wiring not prewired either in dash nor frame, lockout control module under dash required , new rear drive shaft, and a whole lot of time tracing and running wires to make everything work....
I wouldn't do it again. Would rather source a new truck. However as yours is an RV, converting may be your only choice.
Hope I didn't discourage you, just wanted to give you my personal perspective on work involved.