Steve, when we lived in Louisiana which is slighlty warmer than NC, we used to just open the under trailer drains, drain the HWH. blow out the lines, and add a cup of pink antifreeze to each trap.
You should be OK with doing the same as long as you watch the weather for any really cold freezes. There are people on here who live further north than you and use this method for winterizing every year with good results.
If I were you, I'd make sure all the holding tanks and the fresh water tank are empty and if possible, I'd leave the dump valves open so you don't get any possible freezing between the tank and the dump valve.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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