Nearly all Airstreams are fully self-contained for a short while... Since '74 they're self-contained for longer by having a tank for wash water in addition to the blackwater tank for the toilet. If there's no sewer and/or water connection, the (potential) owner renting you the trailer would just need to know that you'll need fresh water and he'll need to plan to dump the tanks somewhere else after the rental.
I think in August in VA you'll want enough electrical service to run the AC.
Il Carriaggio — 1975 Argosy 24 | Il Progetto — 1976 Argosy 28 Center Bath | WBCCI# 15566
He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill