Can't help with campsite but did stay at a vineyard near Bordeaux ( about 12 miles) as it was in the France Passion book ( but you don't need to be a member to stay there). It was the Chateau de Payre , run/owned by Valerie , the 5th generation daughter to inherit and she is very nice and friendly , shows you all around the factory explaining the process and then wine tasting and an invitation to buy some of her award wining wines . I see from this website ( choose English at the top) that she also does, B&B, wine making workshops and organised tours. You park your motorhome in the yard between her house and the factory , all very nice , there is a lovely village, about 4 miles away, for a visit ( best on market day ) Cadillac.
https://www.chateau-du-payre.fr/actualit%C3%A9s/blog/