I think a lot of municipalities have a problem with this. Some more than others. A family moves into a RV park, sets up housekeeping, uses the fire, police and public school systems and don't pay any property tax to cover their fair share of those expenses. Governments are doing what they can to recover those costs and I think they should. It's only fair to the other tax payers.
Property taxes to the RV park owner don't cover those costs so they don't get passed on to the resident. RV parks are intended for tourists not full time residents. If you tie it down you are no longer a tourist.
I think some states (WA I believe) even have a limit on the number of nights you can use an RV before it gets reclassified as a full time residence and taxed accordingly.
