I went on a 'weekend' trip to Boston and found out real quick that the state park there 'required' rabies documentation. I had the rabies tag on their collars but they would not accept that and would not let me in.
Not everyone that gets into a car or RV with their pet carries the documentation paper for the rabies shot. Full Time Rv'ing is another story you bring everything with because it is your home.
IMHO they should have accepted their tags which could have been verified by the number.
That said I ended up having to stay at a motel for the weekend with the MH parked outside my room. :R