I have seen a couple of replies indicating that thus problem could be handled procedurally by shutting off the fridge and taking the food home. That's true, but now you have to cool the fridge each time you go out. That means you either need to run the generators for several hours to cool it quickly, or wait 24 hours for it to cool down on LP. The latter is certainly not conducive when you only plan to stay for a weekend. The former is better, but still restrictive.
I realize this seems stubborn, but I am trying to find a solution that allows our camping style to continue. Oftentimes, a weekend is all we get.