For some reason I can't copy and paste here, but the cars have really changed over the years. Back in the day most were rail buggies and Baja Bugs or modified rally cars usually found at other rallies. Today, most all the cars are custom, fully enclosed, they appear to be similar to a Porshe 908 raised 16/18 inches, GT class taken to off roading.
I can't imagine beating myself black and blue jarring every bone in my body racing a Quad in this rally, Bikes I enjoy and I'm sure are less work than tossing a Quad around.
Pay attention to the 2wd cars, which should answer the classic question on this site; Do I need 4wd for overlanding? (No, you don't)
The landscape is beautiful, rugged, barren and dangerous.