Can't help on the county Stu but man have I heard a few doozy horror-carnage stories about the Dusy trail. A local club did it last year and of the 8-10 vehicles on the run, I think 4-5 of them suffered some pretty serious damage. These pretty hard-core wheelers all had some very well set-up vehicles too. They did have fun but they also came back pretty shell-shocked too.
Sounds like a challenging trip you're contemplating, good luck on it!
