After you read this, you will be sure that I am certifiably nuts, but when I lived in DC, which DOES have freezing temps into the teens and sometime below, I never winterized any RV or boat I owned. This allowed me to use them 12 months of the year (snow camping *is* fun).
With the coaches that didn't have an Aqua Hot, I just made sure I had plenty of propane or could get delivery. The Aqua Hots were just too much fun
. I would leave the Aqua Hot on and generator on auto Start voltage and would go that way 3-4 months each year.
On my Wanderlodge I would use about 100 gals of diesel each year. BTW, I did that while the unit was in a storage lot for 3 years with permission from the owners of the lot. Since out side the smell didn't bother anyone nor the noise.
Yes I know that Murphy's law comes into play and I would never recommend anyone do this
but if you can monitor your coach it does work and gives you flexibility and you can also tell others and they will try to commit you LOL.