When we got our hybrid years ago, we discovered that the Fridge didn't keep up to well with the southern heat. We placed a small "personal" fan behind the fridge and just plugged it into the exterior outlet when we get to our destination.
We now have two 8 year old twins, and no matter what you do, the fridge will not stay cold when it is opened every 20 minutes. We purchased a Coleman Extreme 120qt 5 day cooler about 5 years ago. We pre-chill the cooler and drinks with ice, drain and top off the morning that we leave. The cooler can easily keep ice for 5 days in 90 degree southern heat as long as the kids COMPLETELY shut the lid (which never happens). Our neighbors had a yard sale a few years ago and had a mini Fridge/freezer they were selling. We purchased that to use while camping to place the drinks for the kids in for $25. Best purchase ever. There drinks will stay cold, if they shut "their fridge", our food stays cold in the camper fridge, and the adult beverages stay nice and cold in the Coleman Extreme Cooler (which will last almost as long as a Yeti or Yeti equivalent ($50 cooler.)