Well I guess I'll put in my two-cents worth. I have a 2004 bigsky & we winter in N.W. Montana. I skirt the trailer with 1 1/2" foam board & put
two 75 watt lights underneath. I also get a wired thermometer & put it underneath so I can keep an eye on the temperature underneath from inside. also put a light in the basement. We use electric heaters inside
with a De-Humidifier which keeps the moisture down & heat in. Our humidity usually runs around 32-42%, which helps save the inside of the trailer from mildew. Make sure you go through the door as fast as you can. Gawking at the door will cool it down inside FAST!! It's not uncommon to see -20 to -30 up here. Spending winters up north is what seperates the men from the boys. GOOD-LUCK
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