I installed one of those dual fans that hooks onto the cooling fins in the refrigerator and that really helped. I also put one of those little battery operated fans on last shelf in the fridge. I installed a fan in behind the refrigerator that helps move the air up through the roof vent. All of those things, plus running the unit on gas instead of electric seems to make a big difference especially in hot weather.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.