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When we started out camping, winterizing the tent just meant putting it away for the winter, when we graduated to a truck camper we drained the fresh water tank and the electric pump and hand pump to the sink, wow then we got one with a biffy and I started using RV antifreeze, I have used it ever since and have never had a freeze up in temps as low as -30F. The Montana of course takes more antifreeze to ensure all the pipes are done but even at that it is a maximum of 3 gal and I buy a spare gallon to dump down the drains of all three tanks to protect the valves and the traps.
Some things you cannot blow out but for some that is sufficient due to the temperatures they encounter.
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