You should be OK around the Memphis area with a heat tape on the water hose (or you can use your fresh water tank and disconnect the park water during the nights when it will be below about 30F). As for the trailer, you're going to accumulate a lot of moisture from cooking/bathing/breathing, so you'll need to keep a window on one end of the trailer cracked slightly and remember to always use the bathroom vent fan when showering and the range hood fan (if it vents outside) when cooking/washing dishes. Plan to use about 30 pounds of propane every 3 or 4 days, so you may find that buying a 100 pound tank will be convenient. You might contact a local propane supplier and see if they have a 50 gallon tank that they will provide to sit beside your trailer and fill it on a regular basis for you. It may not be cheaper, but it will surely be more convenient.
As for your sewer hose, just use your onboard tanks and "dry camp" during the evenings, open the tanks to drain during the warm parts of the day. During extended cold snaps which might occur a couple times during the winter, you'll probably wind up with some frozen water pipes. Remember to keep the cupboard doors open so heat can get into those areas, otherwise you'll have frozen canned goods as well as frozen drain pipes.
It's "do-able" and you might consider buying some 1/2" rigid foam to place around the trailer to help insulate the underside and prevent cold air from blowing under the trailer. The "shrink-wrap window film" on all windows that you won't be opening will help retain the heat in your single pane windows, which is probably the greatest heat loss area of your trailer, although you can also expect that the R-9 walls won't be really efficient either....
We're leaving Millington in the morning, headed back to Michigan, it's been awesome weather this week, so winter is still a ways ahead for this area. You've got time to prepare before the "really cold nights" start happening on a regular basis.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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