Good heavens! An RB67!? Come on, you do need portability at that event, rather than a wagon to tow behind you in the blistering heat...

Discussed this with friends at lunch today. They've been twice (won't be going again as they had items stolen from their tent). Their digi cameras worked fine but battery life was their main problem with a lot of shooting. The cameras when not in use were stored in Sea to Summit roll-top hypalon bags and carried around like this until there was a good opportunity to use them. Personally I wouldn't take any of my own cameras to Burning Man; I have enough trouble keeping them dust-free in summer at ConFest and Burning Seed here in Australia, and it's nowhere near as severe as BM. Just take a few disposable 35mm cameras (no batteries to worry about) and be done with it.