I don’t know what this is called (other than “trail riding”), but get a load of these pics of my little brother driving his Jeep over enormous crevasses and rocks and things.

(Yes, I asked him about the environmental aspect…apparently there are fees assessed and environmental remediation done. Huge fines for going off-trail etc., and all trails are created in concert with someone who does environmental analysis, etc.  From what he says, the place in the Moab where they do this is actually better off, environmentally speaking, then other parts!)