For anyone looking to visit Quebec City with an RV/Trailer, I highly recommend staying in Levis (a 12-minute ferry across the St. Lawrence to Old Town). We stayed at Camp Transit - it's about a 10-minute drive from the ferry but they offer two free shuttles daily. The site was nice - bathrooms were clean, they had a nice pool and the staff were very helpful and accommodating. Even better, it provided very easy access to Quebec City. The ferry was really nice at night. We enjoyed it so much we booked an extra day. Note - if the shuttle times don't work for you (we stayed in the city quite late for a concert) it's about a $25 cab ride from the ferry terminal.