I am rebuilding an old camper for this purpose, +1 to insulation and waterproof. In this case I tore the aluminum off replaced 1 1/2 inch of fiberglass with styrofoam and used hardboard and glued fiberglass reinforced panels and sealed the joints heater buddy solar panels and wind turbine are next. Internal water storage so no frozen pipes and a compost toilet. Now I just need to park it. Thanks Pippi for the my rv your land idea on Craigslist. 1 maybe in 2 weeks, reposting it now.