I went and got my car from the shop that did the hitch install. It’s still having electrical issues. The shop was still trying to see if BMW would warranty the body control module, which I think is a dead end, especially with the nearest BMW dealership being over 4 hours away, in Bloomington MN. So I paid off the hitch install, he gave me half off on the labor for that. And I’ll figure out my own solution for the BCM, or FRM as BMW calls it. I did tow the boat down my avenue just to see how it felt, she tows the little boat no problem.
As for symptoms I have no power window controls, no interior lights, no blinkers, and no fog lights. Everything else seems to be working.
I’m going to call the two local euro shops and see if one of them can take care of it in a timely manor. If not I’ll find a reliable refurbishment service and send it in.