Good observations Matt, I have done similar milage myself, 47,000 miles. A couple of things.. I rewired the trigger for the NATO socket to INT1 which means you can charge your trailer all the time. I’m currently in Croatia with my trailer, charging has been working great. I posted a thread on how to do it somewhere..
My air on works well, we have had heat in the high 30’s in the last few days it has coped well, even on fan speed 1…
It’s also great in extreme cold, blows hot well too, it’s getting it to blow warm air thats the issue.
I hot glued the transfer lever pin in over a year ago, it hasn’t moved since…
Great write up…