freezing weather

I have somewhat of the same problem as the author. I live in southernmost coastal NC and going to Florida January mid-month. Have been told that I need not winterize since seldom does temperatures go below 25 degrees for an extended time. Here it might be 25 at night but 50 during the day. Next night might not even get to freezing. My unit is at an outside storage facility with no access to electricity so what precautions can I take??

So, the the question continues in my mind. I hate to drive to Florida in Late January to hookup and have leaks.