^ AmyMac is right on. We did some exploring of national parks in the N. Az/S. Utah area back in May and, while there were RVs at many of them, there were plenty of places I would not have wanted to drive an RV. Driving through the beautiful red rocked areas up in Flagstaff/Sedona, I'd much rather look at the scenery than worry if my huge RV is going to sideswipe something. That said, if you have your heart set on an RV, then more power to you. As I said, there were many places with RVs in abundance. You could always try looking for hotels with kitchenettes if you wanted to cook your own food.
"Corn syrup is everywhere; check your pockets."
"Stop this brownie talk, you devils!" - Sabine