First off Welcome to the club.
I had a 26' Class A with only 1 AC and it never I mean never got cooled down. One ac just can not do the job, especially when its 100 out side. I did find a couple things that helped with the ac.
First is the windshield, you need to get some type of reflective material to stop as much of the suns heat coming in as possible. My wife went to a fabric store and found some highly reflective and breathable material that did a great job.
You need to also add reflective material of some sort to all the windows, this will help keep the heat out. The window on the front door is a big adder to the heat build up.
The roof vents you can either purchase inserts to fill the space or get some styrafoam to fill the area up, those vent although great will cold air out.
I am sure other folks will come on with more help
On a side note for future posts its going to help if you put your coaches info in the signature block i.e. model, year, that type of things.
07 Meridian 36G
Roadmaster tow dolly
Great Wife!! & Max the Frisbee chasing dog.