I've only been RVing 20 years, and I done so all over the rockies and up into Canada. I always tell folks that your RV doesn't "freeze" because the outside temps are around 32 degrees.
It takes multiple days and nights of temps below 30 degrees to really start to get things cold. And, with you heating the inside and running water there is no way a night of freezing temps in your RV will be cold enough to freeze tanks and pipes. Water hoses... sure, but not your 5,000 lb mass of a travel trailer.
I've been in Twin Falls in the Winter and it's extremely cold. But no way a couple of days of near freezing to light freezing is going to be an issue.
One more thing, I've posted my experience and opinions about this many, many times and there are always folks that respond to not risk it. They say to winterize immediately even if it's only one day. And to prove their point they explain that they've never had a problem by winterizing for any 32 degree condition. Of course, they'd never have a problem if they didn't winterize either, but they don't know that.
So, you'll have to do as you see fit.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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