30amp breaker triggered

Yesterday, I had the ac, electric water heater, and rice cooker going and it kept triggering the 30amp breaker outside. I went to the gas water heater and everything was ok.

A/C running 13.5 amps. Starting 30-50 (But not long enough to trip the breaker less it's on the edge already)
Water heatr 10-12 amps. Figure 12, Sub total 25.5 amps.

That leaves 1.5 amps for the converter and the rice cooker 30 amp breakers will, eventually trip at anything over 27 amps) .

Now.. Some parks might have a brand new 30 (Really 31 or 32) amp breaker that will take that load, some it's an older (now down to say 25 amp) Breaker that won't.

This is in addition to sagging voltage driving the 13.5 of the A/C up to around 19 or 20.