Found this site while looking for something else but I think its useful lot of stopovers with GPS cord
http://www.normandie-tourisme.fr/site-grand-public/recherche/resultat-de-la-recherche-157-1.html?keywords=aire+de+camping+car
http://www.normandie-tourisme.fr/site-grand-public/recherche/resultat-de-la-recherche-157-1.html?keywords=aire+de+camping+car