The OP's OP didn't indicate that he had previously owned an RV and what type of living/camping he had done in it. If he had described his past experience, including any cold weather camping, it would have helped with advice given. The OP even became "snarky" with some responders apparently assuming that they wanted to rain on his parade. When posters, asking for advice, do not provide information about past experience, if any, responders may think that the poster has little or no past experience. Also, responders aren't necessarily qualified, by first hand experience, to give advice and all advice should be taken with a grain or two of salt.
