Originally Posted by Chuckinator
no original AC, just receptacle for it...
That should be fairly easy to add then, you need a non-ducted A/C. You can buy any non-ducted A/C unit, personally I'd try to go with something as new as you can. You don't want to risk an older one that may have a frozen compressor or something else going bad. RV A/C units aren't very serviceable, so you basically have to replace the whole unit if something goes bad.
They are easy to add to your trailer if you have all the parts, remove the center roof vent near that receptacle. You may have to cut the hole a little larger, I'm not sure.
One of the RV surplus places would be a good start for finding one, such as Bontrager's RV Surplus in White Pigeon, MI.
They are also good sources for water heaters and awnings as well.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR