Not sure what size your AC is but if it's a 13.5 then an upgrade to a 15 may help you out. With two ac units the first AC is usually 15 and the second is a 13.5. The longer the AC runs the more humidity is removed from the air.
When we camp in the summer we get up early and do stuff. Take a nap or go to town when it gets hot. Then do stuff in the evening when it's a little cooler. With any luck you will get some rain to cool things off but then the humidity goes up. I change my shirt several times a day.
I have never figured out why some manufactures make the cover for some AC units black and not white.
South Florida summer camping is different.