I've driven all over Yellowstone in my Vegas and Axis and there is no problem taking your RV on any road that they say is OK for RVs - which is most of them. Many of the small parking lots in the minor "attractions" have limited parking - especially for an RV, so early arrival is essential. For Old Faithful, it is a huge parking lot, so if you get there early it is not a problem. Even this lot may fill up on a summer weekend. Lots of camping inside the park, but it may be hard to get a space in the summer. Many of the campgrounds take reservations. Little known National Forrest site outside the north entrance thru the small town and up in the hills. It's really nice. We had a buffalo in our site one spring.
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