4-seasons trailer means it's isulated to withstand ambient temps well below freezing. My personal definition would be down to 10°F., but others would argue it should be down to zero.
Northwood states the Artic Fox is a true 4-seasons coach, with heated and insulated holding tanks, R-18 roof, rigid foam insulated walls, and R-7 floors. I'll bet with the furnace set to hold the interior at 68° F., the rig could handle 10° temps without freezing and bursting anything, but I doubt it could handle zero, especially in a west Texas blue norther. And you don't dare run out of propane, or your rig will turn into a block of ice.
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Grumpy ole man with over 60 years towing experience. Now my heaviest trailer is a 7'x16' 5,000-pound flatbed utility trailer, my tow vehicle is a 2019 F-150 Lariat 3.5L EcoBoost SuperCab with Max Tow (1,904 pounds payload capacity).
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