Brad Newham used to have the servo at Birdsville years ago, then 4x4 shop in Bayswater and now in south Aust, he told me 90% of desert failures were due to computer failure [dust]. And as stropp said you don't need a 4by , as someone made it up Big Red in a HQ sedan, while all the 4bys were working out how to get uplined up down the bottom.. on the flip side guy in NSW has Challenge prepped Range Rover cost approx $200K took new supercharged one around his test track and stated it does everything my Comp truck does BUT BETTER, Go figure