Good stuff all around. I debated a Jeep or ATV rental while we were there. In the end, concerns for my wife's back pain won out and we didn't do either. I did drive my crew cab dually on a couple of dirt roads, but basically was ready to bail if things got too hard. A couple of sandy areas but nothing major.
My real concern is not knowing what I don't know and ending up over my head before I realize it. I think if I had rented a jeep, I would have pushed that line further than I should and may have gotten myself into trouble.
What I really want to do is take my buddy who has 20+ years of very technical off-roading and either let him ride shot gun to keep me from doing something stupid.