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For tts, check out the Open Range Roamer and Open Range Mesa Ridge lines. they are pretty well insulated. I think you will find that most rvs will not stand up to Alaska winters without help.

We have survived temps below freezing in our Jayco (insulated but not heated underbelly) and our Sprinter (heated and insulated underbelly, cousin to the Outback) though not in either for extended periods of time (more than four days). Neither sustained damage but the Sprinter was better on propane use.