A update :
This weekend I went camping on a 95 degree day with humidity levels in the 70's. I don't usually do this. I went camping to a different park when what I usually do and it was a partly shaded spot. So, I would say about 1/4 of the TT was in the shade. I do not have a humidity meter in the TT.
I have what they call a 20 foot TT. But, only about 18 foot of it is the trailer, the rest is hitch or something. ( I have no idea why they call it a 20 foot.)It has no slides. I kept the roll up style window shades pulled down.
At 6 PM when I unhooked it was 95 degrees inside the TT. By 7 with the AC on it had fallen to 78 inside. By 8 it was 72 degrees and the AC was cycling on and off like it is suppose to. By 8 pm the outside temp had fallen to 88 degrees. (I have no idea the BTU of this AC.) The humidity "felt" fine inside and a lot of water was running off of the roof.
Now the fridge was a different matter. When I left home is was cold and had some food and beverages in it. When I got to the park and unhooked at 6 it was 45 degrees inside running the fridge on propane. I've never had a problem with it before but, like I said I don't often camp when it is this hot. I put a gallon zip lock bag about half full of ice inside the refrigerator section and by 8 it was 35 degrees in there. I moved the bag of ice to the freezer section. I stayed on propane all weekend because the voltage at this park was not great so I left it on propane. The fridge worked well all the rest of weekend after that .