Hi Dave,
Today I was able to find the wiring schematic of my 940 and noticed that my car is pre-wired for the towing hitch.
In fact, I found the "D5" 10 pin connector in the back of the trunk, on the driver's side.
https://postimg.cc/p5BQwQPJ
I assume this should take care of all the issues you mentioned in your post.
The only question is how to connect the 10-pin connector to the 4-way you find in the U-Haul.
Since I cannot find a pre-made universal 10-pin to 4-pin connector, I might have to locate a male connector and solder it to the four wires of the 4-way connector.
Thoughts?
Alex
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