No real winterization needed other than emptying it. I usually add about 3 gals of water with some Odoban, flush for a minute or so, let sit a while and drain. This deodorizes and kills most bacteria. Some people, add a little RV antifreeze, but I am not a fan of that as some of the products attack the slide seal. One caution. If the TM is not level when you drain it and you close the dump valve and then move the TM with the toilet valve open, some liquid can drain into the dump valve plumbing. If not drained again, it can crack the PVC leading to the dump valve.
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