Family doing 3 month summer trip, Class C or Travel Trailer?

Public State Parks in Orgon,
The Oregon State Parks are beautiful but local Oregon folks tend to make reservations way in advance and generally for the week ends. For me I don't want to have to deal with having to move and find another RV Park every weekend. Oregon State Parks tend to have smaller sites and not easy to maneuver around if the park if you have a larger RV 30' plus. I always use private RV parks and make reservations about a week in advance to avoid an RV park that is full. Just what works for me:)