We visited Yellowstone in '15 with our Class C and Honda CRV in tow. Stayed at Fishing Bridge Campground with FHU. One day we used the toad to tour the park and the next the Class C. We had no problems parking the Class C and enjoyed the day much more because we had all the conveniences on hand during the long day. The suggestions to start EARLY are good ones (we didn't do that and spent a lot of time in traffic and looking for parking). There is a huge parking lot at the lodge where we parked away from the crowds and took naps and had a wonderful lunch in the lodge. 40 miles outside the East entrance, we stopped on our way home at Newton Creek NFS CG for $15. That site was spectacular and a highlight for me compared to the bland campgrounds inside the park. The KOA is a good idea, one I plan to try in 2021 when we go out West again.