Some other tips to help:
Keep the blinds closed and consider putting reflective liners in the windows behind the blinds. Reflectix is one brand. Sun beating in the windows heats the blinds and does help raise the inside temps.
Run the AC all night and let it get ahead of the game from morning going forward. It's a lot easier to keep it cool than to get it cool once it gets hot.
Once it gets hot inside and your lost the keep it cool battle, don't be afraid to open ceiling vents and run the vent fans to remove the layer of hot air. Remember, Hot air rises. The cold air from your AC sinks. The hottest air in the camper will be in the ceiling and running the vents while the AC is running CAN help sometimes. It really depends where your AC vents too.
If you can curtain off an area to have the AC cooling a smaller area, it will be more effective on the hottest of hot days. Again, close bathroom doors and run the vent fan, Close off the bedroom and open a window and put a box fan in it pointing out to exhaust the uncooled air until nightfall.
Get in there and fight for a shady spot or 30Amp+ 20amp hookup as your AC will need the help.
When all else fails, a tub with some ice water to soak your bare feet in while in the lawn chair outside in the awnings shade will make you feel like you're in the AC. I learned this one day when it was 104 and we were camping for a race in a field without a genny. Saw a bunch of people with kids pools/tubs/ice coolers with their feet in them and asked and learned something. It works!
Good Luck and cooler days ahead! (No pun intended).