Hi, spent many months in France. It depends what you like doing. Aires are ok, but often you are limited to a certain number of days, and at times they can lack a bit of privacy, and many don't allow "campsite behaviour"...i.e. no chairs or tables etc. And some are just glorified car parks. There are so many campsites in France that you won't need to book. Check out ACSI camping card guide, which gives discounted rates at thousands of sites throughout all of Europe. Also check the site "campercontact ", it has thousands of aires with reviews, facilities, prices etc. Top tip on sites, if you've got solar don't take electricity, it's always an additional cost. (Unless it's already included of course).