One other minor (but sorta cool) development this week: Now that the driver door is removable and I take it off when putting the car in the trailer, I needed to figure out what to do with the door once it was off. Sticking it in the pickup truck backseat was not a longterm solution.
I visited my trailer shop and they made a solution that I am QUITE happy with. They created a custom bracket that holds the door. The pegs from the door hinge hook in on one side and they created a latch point on the other side that the door latch simply closes on. It's as if the door is sitting on the car as far as the door is concerned.
We weren't sure the car would be able to drive into the trailer with the door on the wall, but it turns out it was no problem at all. There are several inches of room between the passenger mirror and the door hanging on the wall.
Check it out: