Our first tractor that my DH built has a very sturdy coop & I am not worried about the colder weather. Our other two tractors are large and more like a dog lot on wheels. They were the design suggested by our local ag agent & he said to wrap them in plastic as a wind break this winter, but they would be fine. When do we need to wrap them in plastic (what temperature)... and do you think this will be enough? Thanks!