None of us has ever been with a RV. We rented by curiosity, we had no expectations. This was a very good thing.
freedom: not at all, you can park only in RV camping spots. Even in October was pretty difficult to find a place near the national parks, so in high season, it must be impossible without reservation. So the freedom is very limited. Plus you need to connect to electric, sewer, water every 3 days.