Camping les Verts Bois at Freland - in the Vosges hills to the west of Colmar is the sort of small quiet site that we like, and you might like,too, but I'm afraid I know nothing about storage there or in the area.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.