We were just asked for the first time to provide a picture of our motorhome. We've stayed at the place before and they already know our motorhome is older. We sent a photo and received our reservation confirmation within a few minutes so I guess it passed muster. In this case it is called a resort and some of the lots are owned by people who don't want a junker next to their nicely landscaped and maintained pad. Can't say I blame them. You pay a lot of money for a nice lot in a good location, pay monthly fees, and you want to maintain a nice looking environment. As long as the RV looks decent and clean and not like it's on its last leg, you'll probably be okay. They probably would frown on a converted school bus But also keep in mind, they do have the right to refuse anyone who doesn't meet their criteria.
When the economy spiraled downward a few years ago and people lost their homes, many turned to RVs as a "cheap" way to have a roof over their heads. Then campground owners faced the issue of people whose RVs break down, can't be moved, and then the owner can't evict them. That's when we started seeing the "10 year rule" and being asked for a photo of the rig. An example is a place we stayed at in Canada a couple of years ago where the young couple had bought the campground the previous year and were trying to get rid of the old trailers that were no longer occupied so it could once again be a "real" campground instead of a permanent residence. We also stayed in a midwestern city-owned campground that was full of permanent or semi-permanent residents who were in sites at the back of the property so it looked better near the front. I suspect that's why so many public campgrounds limit stays to two weeks.
ArdraF