Your breaker in the inside panel has a 30 amp main breaker so that limits it. IF, and it's a big IF the cg is providing 120 volts than you have the full 30 amps to use. If the voltage drops, then the amperage draw will rise (Ohm's Law) and your devises will draw higher amps. My camper has the 15K roof top unit and I can get away with the microwave and the ac on IF the cg is providing 120 volts but then again I have an Autoformer -
https://hughesautoformers.com/ to help out with high demand.