Winter Camping in Jayflight 32BHDS w/ Thermal Package

My TT is nothing special no winter pkg and so forth. I have had nights around 0 up on the elk hunt and have been fine. I just did like others have said left the cabinet door open as well as the bathroom. I left the bathroom closed the first night and it froze the water inlet in the toilet bowl, but that was it. It had thawed by the time we got back from the morning hunt.