Like stated,condensation will probably be the biggest issue/worry.
If you leave a window cracked open on each end of the RV, plus maybe the over head vent in the bathroom, it will help a lot to get rid of moisture. Make sure you leave them open when you go out hunting also. If you have electric where you will be setup, an electric heater with it's fan running will move some air. Which will also help.
Leave all the cupboard and closet doors cracked open also. Try not to pack any clothes tight to the wall. They become a wick.
Just how cold it gets will be your determining factor. We have been out when the temps were in the mid teens.
Good luck on the hunt.