I'm sure many of you know about these little RV fridge fans that operate on 2 D cells. Since our fridges are absorption type units these fans help to distribute the cold air around the inside of the fridge to avoid warm spots. They also have a charcoal filter. This can be used when you have food in the fridge but no propane or electric running it. If your food is cold or frozen when you put it into a cooled down fridge it should be good for at least 5-6 hours before worrying about spoilage as long as you resist opening the door. As others have said, you can take an ice chest for things you want to get to before you arrive. We also pack s few of those blue freezable ice blocks in the fridge for extra cooling. They are flat and very packable. The fan costs about $12 on Amazon Prime.
https://flic.kr/p/RiR9eK
https://flic.kr/p/RiR9eK