Route south to Spain

I am in the final throes of planning the route to southern Spain from Dunkerque. I plan to go the western route via Rouen, Dreux, Chartres etc.  I reckon my first stop will be about 400k which puts me south of Rouen maybe as far as Chartres. i can only find 3 sites in ASCI in that area. They are - Chateau Gaillard by Rouen, Campsite des Etangs de Marsalin near Dreux and Les Bords de l'Eure near Chartres. Only the last accepts the ACSI card. Do any members know these sites or can recommend others around the area. I don't think I can go further because we are on the 10.00 am from Dunkerque. We are towing a 7.20m caravan.