My wife and I just purchased a 2002 SunVoyager . The seller assured me the rv has been winterized and I believe it because it was 10 degrees when we picked it up and nothing seems frozen or unusual. It will sit outside all winter ( Minnesota ) , should I pull the batteries out or just start the unit occasionally ? We plan on using maybe once later this year for a practice run and then a trip to North Dakota next summer then onto Az next winter . Any suggestions would be greatly appreciated. Thanks