In which part of SC do you live? I'm in the upstate and I don't take chances on winterizing. Only blowing out lines is risky. The PEX tubing can stand some water freezing but I am leary that blowing out will leave water in low fittings, which are hard plastic and can't withstand freezing water.
The advice to remove and discard the water filter element assumes you are done for the season. Just remove it, take it into the house and let it dry.
Empty the fresh water tank and the holding tanks. The flat bottom holding tanks aren't likely to be damaged if a little water is let in them, but freezing water will wreck the holding tank drains, so pour some antifreeze in the toilet and shower to protect the holding tank drains.
Be aware that it's not likely the fresh water tank can drain completely. The drain connection on ours is on the side, not the bottom. If you don't put antifreeze in it, keep it warm. I put antifreeze in ours. I fill and drain it twice when we are getting ready for a trip and have no problem with taste. If you do have some taste, you can put a box of baking soda in the tank as you fill it to nearly completely get rid of antifreeze taste.
As JSO said above, put light bulbs in the utility compartments. You need one in the water pump/filter compartment and one in the holding tank drain compartment. Of course, use incandescent bulbs. You want the heat. 40 watts should be fine.
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RamblerGuy
2011 Sunseeker 3100
2016 Ford Edge Toad
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