I think it depends on the class and vehicle. Off-road racing isn't a sport I"m super aware of how things run, to be honest. Which is ironic, since I grew up in the desert, flying around in pre-runner trucks and on 4 wheelers.I have actually known about/watched some of this before, but just didn't really know the name!
I always find it very impressive, and great fun to watch. Do you know if they have a navigator in the vehicles as well?