...So, after many hours and days of research, I've finally decided to install a quietest portal A/c inside my trailer - A 10K BTU Haier with a whisper quiet mode that I am very please with.
For my little trailer, there are two locations that I can place the A/c, but the location at the end of the main bed, next to the window is the best for this trailer.
I will have to figure out how to do a modification to install an exhaust and the draining water.
For sure, I will have a cut a 4" round hole through the wall for the exhaust, and I am kind of nervous at this task, but I love the quietness of the new A/c.
I will add a few photos soon.
Wish me luck!
Nick