A/C breaker keeps kicking off on 1st night of camping

Replace the breaker(s). We didn't have the problem new, but not long after, we were tripping the breaker often.
To begin with, the breakers installed in your camper are cheap.
Next, each time breakers trip, they become weaker.
We replaced all of our breakers about 3 years ago and have not thrown a breaker since.
We have tripped the breaker on the campground pedastal a couple of times.
But have not tripped an inside breaker since.