I have had a Class B for well over 40 years. The beauty of the Class B is that you can go into any town and get what you want. Generally I only hook up electric until I know that I am there to stay. I made a sign that says Site Occupied and leave in on the picnic table or I leave our chairs out.
Twice I have had the site rented to another RV. Sometimes there is just a mix up at the office. While in both cases, I was given another site, they were not sites I would have picked out myself.