You could just add, "Remove one wire from the battery." to your winterizing checklist. We live where it gets cold - it was 23° F this morning and below zero for quite a while during the winter. All I've ever had to do to winterize was open the drains, open the faucets, and pour a little RV antifreeze in the drains. I don't think that part is even necessary, but being a little over cautious can't hurt. Some people have reported parasitic loads even when the TM is closed, so I would pull a wire from the battery - preferably the ground side or take the fuse out of the hot wire - just don't lose it!
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