It's tripping because you're exceeding 30A in the camper. The A/C draws 11-12, the microwave the same, the water heater on electric draws 10, the convertor 5-6...easy to exceed when running the A/C.
I have a hard-wired Progressive Industries surge protection with a readout of the amperage draw. A lot less trips of the main breaker now.
Nights camped in 2013 - 55, 2014 - 105, 2015 - 63