We have 2 A/C units - they work well keeping the trailer comfortable.
Only use both units at the same time when temps are very high or initial cool down after arrival.
My only complaint has been the noise from the 2nd A/C unit - it's a Mach 8 13.5BTU Front Bedroom A/C unit.
Sounds like a jet engine when running.
Just received and installed a Fan Blade replacement kit from Coleman-Mach.
Initial test in the driveway, the kit seemed to lower the noise level significantly.
We'll see on our next trip.
For others experiencing similar noise issues from their Mach 8 A/C unit, the Coleman-Mach's Fan Blade replacement kit is Item #: 1472D5041.
Coleman-Mach was nice enough to provide us with it under warranty even though we've had our trailer for a little over 2 years and was out of the warranty period.
There's also a Mach 8 Hush Kit
on the market that can be purchased and installed that is supposed to significantly reduce the noise.