OK so this went really well for me. The roof really was not all that round. And the foam on the ac unit was indeed think and soaked up any imperfection. I did bring in a cheap internet price and camping world matched it and honored there weekend 10 percent sale on top of that too. They also had the penguin II in stock as well!
I put it in first and noticed there was no chance in heck it was going to keep up with the sun. So I started out with foam board on the roof and noticed a immediate improvement. Then with batting I next insulated where the round corners of the roof where it met the wall. I have actually burnt my self (there black and in the sun) climbing on and touching them in the inside. So as I worked my way down the trailer the cold followed me.
Man what a difference. Cant wait to get out of a hot race car and then the hot fire suit and into the nice cool dry trailer.