About the A/C. I assume that the A/C is fully functional and, yes, that is a lot of square feet for a trailer that is sitting in the sun. I looked at the floor plan and noticed the four bunks in the back. That sort of suggests multiple children. Children being children, it begs the question of just how many times times a day is the door being opened, and for how long? Other than that possible issue, I have two suggestions. A) Consider moving to a different lot (changing the orientation of the trailer relative to the sun) if doing so would reduce the heat load. B) Consider closing the bunk-room vents and door during the day.
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.