Sue, I wouldn't worry about it unless it's going to be 27 or below for more than an hour or so.
Bob & Carol, how cold does it get in your area and for how long? It takes at least an hour, maybe two, to get a good hard freeze of the water so if temperatures are going to be 27 or below for more than an hour or two then I'd consider using rv antifreeze to winterize. You could always flush the antifreeze when you want to use the Montana and refill with water then do it again when you leave. Or just drain everything before leaving. If temperatures dip to 27 for a couple of hours then rise back into the upper 30's I doubt you'd have a problem with the method you propose. Just an opinion.
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