The guy I saw that ran one in a buggy took his cores out of the rear and had 2 psi up front.
The tread is very hard though, and IMO they don't grip too well, but with a little bit of work, they'll take you anywhere. Jason's mog is really light so he has an especially rough time, but he made a climb that I couldn't make. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif