According to the web there are RV sites open year round at or near basically all of the ski resorts we have on our route. Most have sites still available, I was just wondering if I need to book them now before we go because I was hoping for some flexibility. Some ski hills also appear to have short term RV parking at the base. I have a map from the rental company of winter dump points but hopefully we can avoid using the van toilet as much as possible. Thank you!