Camping by small van or large estate car mpv, overnight without problems in Spain, beach parking areas and beach, especially Castel de Ferro area, Almeria coast line, you come across a few camper vans and also local rod fishermen night fishing forming tents with umbrellas and the like.
France - Parked all over BUT discreet! Places in villages as in center parking, back lane, or grassed parking areas, some have designated areas in small towns, there's also lay-byes that are well off road in places, on the main route's lay-byes are used by many and some have toilets, I am always aware to park either where others are or completely out of vision for safety, I have only been moved once, there was a big boules tournament following day, I should have noticed adverts, so always check!!! Could end up in middle of a car boot sale in morning, thats been done!
So really just use common-sense and respect.