Just to give you guys an idea of the races, here are a few videos from last year. Only 40% of the rigs that started the race actually finished. My brother-in-law raced twice and didn't get through one lap, so it can be pretty intense.

Helmet Cam from a Class B jeep Wrangler at Devils Playground (similar track to Class A)
http://www.youtube.com/watch?v=imsHWmLYWPY

Harlan, KY KOH qualifier Class C (DVD preview)
http://www.youtube.com/watch?v=Xt-vQIgefHY

The Flats, NC Class A (VX class)
http://www.youtube.com/watch?v=SV9kbjayrO0