The campground is misinformed. Breakers do wear out. Campground usage very much speeds up that process. Breakers are not designed to be used as switches. Yet that is exactly how many people use them, turning off the breaker before plugging in their rigs and the like. You don't do that at home when you plug in a lamp or your toaster. Like others have posted, the unusual heat and the fact the park is full is adding to the problem. Plus, it sounds like both your AC units are on the same leg of service, which would be a bit odd. If they were on opposite legs, turning the 2nd AC on materially effect the breaker since the loads would be balanced. Are you running some other high amperage devices like the water heater on AC, the microwave or running electric cooktops etc.? All those add a lot to the load. So does your converter/charger if the house batteries are being charged at a high rate. All those add to the loads and can eventually lead to the breaker tripping. But yes, the park should consider changing out the breaker as first step, especially if yours is the only problem pedestal.