On Monday ,if not before, I shall contact the "PLOUGH ", in Long Wittenham . They are folk-friendly ( There is a folk club there ! ) and the pub has good facilities----two bars & two dining -rooms, from memory . Out the back, is a HUGE camping area, terraced, and running down to a Thames backwater ( weirstream ).Camper -vans might be a problem, ----I"m not sure. The lady who runs the folk-club is in an Appalachian side as well, but I can"t remember which one !!! Still, worth a try, I guess..