As a fellow owner of a 2000 200 Versatile this is hugely appreciated.
If I may, though, touch on the extension cord. Your misgivings on it are real for two reasons.
A, you really do need a weather proof junction box there.
B, I would not count on flex tape being permanent. Having the cords plugged in and that junction being at the bottom of a "water loop", I think, is not the preferred way to do this. I assume that tape will degrade over time(how long is a guess) and let water leak into the electrics. JMO, but I wouldn't wait more than a year, sooner would be better, and then you will be done. At a minimum, I would tie that junction up so it is not at the bottom of the loop. Perhaps attach a tying means on the side case of the AC unit.
But other than that, what a totally awesome job and video.
BTW, I think the 10k units are no longer available in this size is due to efficiency standards. To be more efficient the AC units require larger coils. I have a Fridgidare 10k unit that looks identical to the current 8k units in my RT that was installed at a shop by the previous owner in 2012. The shop apparently knew what they were doing as there have been no issues. We have the "fancy" one with a remote, filter, and automatic delay start. This 10k unit had a tough go of it when the temps got up to 109 in OR. It kept the cabin at about 80, with no reflectix except the windshield. We have since added a set of drapes that close off the front cab area.This really helps on cold nights and hot days.
Again, thank you for doing this.
2000 Roadtrek Chevy 200 Versatile
'15 Kawasaki Versys650LT
'98 Kawasaki KLR650