We are going on our first overseas trip with our motorhome this August, driving down near Grenoble(S,E France) with ds3 and dd1 I want to make a couple of overnight stops (dijon, Burgandy area) where they play swim etc before having to pack them up for several hours driving, but I'm having difficulty finding/ picking sites. Can you just roll up in France or does it have to be booked a month in advance like the UK? Any info greatly appreciated..