Been doing all kinds of stuff. Our son had to swap out the AC unit on his RV trailer, mainly went to help to get on the roof. The existing unit had a thermostat with the ac and he researched using a house style thermostat with new unit, found many people had done this, but no details on wiring.
It took a little more doing to figure out the wiring, but finally got it, we were being conservative as didn’t want to chance letting the majic smoke out of anything.
His skid steer made it pretty easy to get unit on roof.

He just carried the new unit to hole, the old one he dragged on a blanket to edge.

Four bolts through a steel frame inside to the unit on top sandwich the roof. Just like a dang car, no room to get my hands on anything.

The RV has a 12 volt supply along with the 120 volt feed. The hang up with the wiring was there wasn’t clear connection point between ac and thermostat. I had him mock up the thermostat with 12 volt and run through the functions to confirm output, then we were comfortable making connections and it fired right up with no sparks.
I did pay homage to Shortys thread.

When I was on the ladder lifting the one end of the unit onto roof, my hand was very lightly against the coils, it’s like I used a food slicer on my hand.
This was a critical project to get done, as he will be supplying us with our grandson in the coming week. We didn’t want him to be overcooked!!
We actually started to do Saturday, backed off because lack of wiring info. First thing Sunday morning I get a text “guess what quit working at 2:00 AM?)
I learned some new things!.