Or sub-title, cheap man's a/c
Since I already had this small 5,000 BTU unit I thought that I'd mock up a shelf for it in the emergency escape window. I was pleasantly surprised to find the opening for the handle lent itself to putting a tang on the shelf, with a pin, that holds the shelf firmly against the trailer. That saved making some other brackets.
Before I knew it the a/c was on the shelf running. Looks like it's doable so I'll do the finishing stuff and if it's stinking hot at Osoyoss I'll be smiling. No, it's not intended to be used overnight, just to cool down the interior before going to bed.