I also live in Florida and have had lots of dealings with the hot weather. We get the double whammy: 95 degree temperature and 95% humidity. Florida is a swamp.
An RV has insulation but it also has windows. Shades help a bit and shade from trees do also. But to keep the blazing sun from heating the shades and putting a strain on the A/C I purchase the biggest auto windshield shades I can and stick them between the RV windows and RV shades (Not just the windshield. All the windows). You may need to cut to fit. Don't forget the vents on the roof. A piece of foam works best there.
When they build the RV they run the pipes and cables through holes in the floor. Remove the bottom drawers or open the cabinets to see these holes. If they didn't use expanding foam to seal the holes use it now. I'm referring to the foam in a can. A popular brand is "Great Stuff" and it comes in white and gray. RV manufacturers use gray for some reason. That's a good enough reason for me to use it. Follow the directions on the can.
This will also help keep the rats out. Incidentally if you want to keep the rats out keep the lights on in the storage compartments below. Rats don't like light. They are nocturnal and the basement compartments are the first place they come in at. Rats also like tissue to make a nest and food to eat. Keep these items up high.
The front door is used a lot. You need to go out and come in once in a while. The more it's used the more the A/C comes on. Try to use it sparingly during hot weather. If possible use the awning to cool that side of the RV. Good luck.