The wood-framed and insulated Capri Cowboy has been used often around 15F in the Beartooth mountains. Winter tent camping experience in my youth and an extra-large -40 sleeping bag are useful. The propane heater is actually too warm, even on low, so I keep the bottle valve off. Biggest problems to date have been one instance of a frozen Porta-Potti and several of split water cans.
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