Before setting out on your U.S. RV road trip, it is important to know that you can't just park your vehicle wherever you like. Of course, you can drive around, but sometimes it is not possible to park on the street. It is also prohibited to park your RV in a retail parking lot (with the exception of Walmart stores). If you wish to park your vehicle while visiting an attraction or destination, you may be required to use the designated bus/large vehicle parking lot.
You will often find directions at the entrance to the city you are visiting, or ask at the tourist information office. It may be a good idea to leave your vehicle in a paid public parking lot for the day and explore on foot or by public transit.
National parks offer special parking spaces for large vehicles like RVs.