Tell them to take torches Salad with batteries and they will need breath test kits from Halfords, yellow hi-viz jackets on their seats not stowed away, GP stickers and if they are carrying bikes, a red/white stripped warning sign. Bucket. Bowls. Dried foods. Don't drink water unless in sealed bottles or boiled well. Tell them to ENJOY but do beware of migrants trying to get into the back of their camper on their return!!! Has happened a lot in recent weeks . I think that there are some areas in French towns : aires : where camping is free ;-)