Keith -
Your outside hoses will freeze easily - fresh water hose and accordian sewer hose. If you expect freezing weather, drain them both - couldn't hurt to leave them disconnected untill morning. If the fresh water hose freezes, it proabably won't be hurt because it is pretty tough and at least a bit stretchy to accomodate the expansion of the freezing water. If the sewer hose freezes, it is very fragile! Don't touch it, don't lift it, don't try to urge the ice out of it. The thin plastic skin is VERY fragile, and you will surely puncture it.
At the temps you are talking about, the TM plumbing won't freeze, because it is exposed to indoor heat sources. This includes the fresh water tank, the black water (in the toilet tank), and the water heater, of course. With temps in the 20's, the gray water tank won't freeze because a) the water was at least a bit warm when it entered the tank, and b) the soap, etc, in it lowers the freezing point of the water a bit.
You might unscrew the outside shower head and bring it inside. It is kind of exposed out there, and kind of fragile.
Bill
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