Just plain rough terrain, down there. It only looks flat from the air. I used to own a custom-built 4X that was one of a pair built for the other race. One is raced, the other used as a chase car. The crew got killed (by all accounts, alcohol-related). I bought the one that had become the chase car, as the owners couldn’t stand to see it, after what had happened. Nothing good about a guy dying - but all all off-roading carries risks (including for those who aren’t racing). Don’t think I’d care to do it on 2 wheels, though. At least with a truck, you can provision yourself for most emergencies you could survive…