Wow, thanks a million for the link. After I watched the video I went out to my trailer, dropped the inside AC cover and discovered my divider was worse than the one in the video! I also discovered the AC hold down bolts that hold the AC to the roof were also loose. There were also gaps between the framing and the ducts, so cold air was blowing into the roof area instead of going into the ducts. Not what I expected in a new trailer just 2 years old.
It took me about 45 minutes to correct all of the discrepancies and button it back up. When I turned on the fan I could not believe the difference!
Last week we were camping in 100 degree temps and I was a little disappointed in the AC cooling. My unit is a 15k and my trailer is only 29 foot, so I had expected better results. Today the temps are in the 60's so I can't give it a good test, but from the amount of increased air flow I know it's got to be an improvement.
That video should be a Sticky and kept available for future use. If you have never looked at your AC unit, watch the video and go out and look at your AC. I have a feeling you may be surprised at what you find......