I think for bikes it's the weather that's the killer, I did it last year east to west with a friend in fantastic conditions and the ride was amazing. I can imagine it being a totally different experience in the wet though, maybe I will try it sometime  . As Walter says the bridges are the main problem for 4WD, the 2 big ones are guarded so if they do let you drive them at least they will know when the next train is due. We crossed a couple of other smaller ones on the bikes but that's easy to bump them onto the side of the track and shoot through. Also I wouldn't fancy sitting in a 4WD day after day over those roads! I'd end up with piles! Ha ha
Good luck and look forward to reading your progress.
Mark
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