
I admire your stamina and am jealous of your bravado and lifestyle. Just a note to tell you how to fix almost all of the things you mentioned as extra-difficult living in an RV in the winter in Alaska. I have seen RVs designed specifically for use in such conditions. The alterations are designed in from the beginning and built into it. The era your unit was built, they didn’t do these things and I’m sure buying one that is equipped this way costs WAY more than the one you bought, but I can also say I suspect you could sell yours to someone living a bit more southerly for a pretty good penny, though I also suspect you’re not particularly interested in making a change since what you have is actually working for you.
And some RVs–for example Airstreams–do go up in value (or at least hold their own) if you play your cards right. For example, our Airstream was selling for around $7000 in 1976, when it was brand new. If we had it in the pristine condition we could should we give her 3 months time, selling it for $30,000 wouldn’t be out of the question, which is about inline with what $7k in 1976 would be equivalent to today.