Winter where ? Southern Florida or The UP of Michigan ?
We have camped at 17 below zero and condensation is an issue that opening a window won't solve .
We don't have a generator and never will. We have solar
. Generators have a tendency to bother people any time of the day
We do not heat or cool our trailer when driving . Since no one should ride in a moving trailer there's no sense cooling the furniture. Our dog rides in our vehicle which is air conditioned and stays in our air conditioned trailer when camped.
He's never complained in over 30,000 miles of travel.
We have a universal key for all our trailer's locked storage doors ,
that way if you loose your keys you can borrow the neighbors .