Ideas for keeping frig in outdoor kitchen cooler?

We have camped at Ocean Lakes for 2 week stints for the past 5 years with an OK and fridge. The only issue I have is ice build up on the freezer part due to the humidity and opening and closing it all the time to get cold ones. At night I have opened the fridge door just to let the ice melt. I don't have any complaints. I mostly leave the door closed during the day since the sun hits it but leave open at night. I also prop it open sometimes just to let the heat escape.