IMHO there are no real definitions for any of the three terms, although I agree that places that call themselves campgrounds are likely to be a bit more rural. But RV Park and RV Resort are used interchangeably and I don't pay much attention to either. If you want to charge more for your sites, be sure you call your "park" a "resort"; that will justify at least a 20% price increase!
We have been at a few places that could truly be thought of as "resorts" because of all the other amenities they have, such as pools, hot tubs, exercise rooms, etc. But, in our experience, the overall nature of the place is not a good guide as to how big or attractive the individual sites are. "Destination locations" often have RV resorts with very small sites, such as those found in many of the snowbird parks in AZ. The park we are currently at in South TX has sites that range from pretty good to fair but we are on the beach in a popular area and these are good compared to many.
