I have the enclosed underbelly and I've camped in the upper 20s but personally, I would not push single digit temperatures if you plan to use the water tank. The tanks are heated by ambient temperature from the furnace so you'll have to keep it going. The issue I see at those temps is the risk off the low point drains and dump valves freezing since they are exposed.
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2018 28BHBE
2017 Ford F250 XLT, 6.2 gasser
2013 26BH (traded)
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