Mrs T & I did it in mid 2008, west to east. Tyre pressures 28psi on the Rig Rd and Knolls Track (as recommended by the helpful folk at Mt Dare Roadhouse), and 15 psi along the French Line. We had no issues, didn't chew the track, as confirmed by a chap following us along the French Line, who commented on how easily we were travelling, and how little we were disturbing the track.