Adding second AC to trailer?

I have a 30’ Autumn Ridge with 50amp service. My 15k AC during the summer in AZ was pathetic and couldn’t cool much below 85 degrees in 100 degree weather. I was all set to add a 2nd AC when I happened to see the following video. Once I made the repairs and sealed my vents so that the cold air wasn’t going into the space between the ceiling and the roof I no longer felt the need to get a 2nd AC.

Watch and learn:
https://m.youtube.com/watch?feature=youtu.be&v=rxCljBVi8DU