As I said earlier, I used corrugated plastic with the clips to hold it inside the emergency window. This is not a permanent setup and was never intended to be. I was able to set up and take down in less than a few minutes.
On the outside, the shelf was made from a piece of board and a metal rail than simply hung on the edge of the window frame. To keep the window from leaning on the a/c and creating vibration I used the long handle that holds the window open to prop the window open over the a/c.
The a/c never caused vibration, ran on low fan speed, and did a wonderful job of cooling.
My current trailer has the same emergency window but it is in a bedroom slideout. Sounds good but the a/c caused the slide to vibrate creating quite a bit of noise.
I guess I should pursue a solution. I have never used the roof air. I consider it a boat anchor that won't run off of my Honda 2000 and turns the trailer into an icebox not to mention the fan noise and overall vibration.
I'm thinking of going to a high-wall or minisplit.
I hope you find this helpful. Any questions feel free to ask.
