30A Circuit Breaker at house tripping

Janss wrote:
Motorhome plugged in full time. Temps outside around 100-105 degrees. MH basement a/c running constantly during the day. Except when the circuit breaker trips :( I'm talking about the one on the side of my house, not inside the motorhome.

Panel inside MH shows 26 or 27 amps for a/c and frig.

Breaker doesn't feel loose or worn to me. 30amp plug looks okay, not melted. Why is the breaker tripping? Because the circuit is getting too hot, just because the a/c is working so hard due to the hot weather?

Could be the breaker has some fatigue.
Even at a constant 30amps, some may never trip.
Momentary inrushes, during startups and such, should have no effect unless the curve has been affected with some fatigue as well.
You didn't say whether or not you had an EMS for managing your load, but if you're not ever exceeding 30amps, then it shouldn't make a difference.
Does the breaker feel extremely hot to the touch?