If you really need it it 'might' be possible to run the A/C.
1) Use an RV 30a extension cord, not a 15a one. Plug in with adapter right to outlet. This will help minimize the line loss.
2) Only run the fridge and hot water on gas. No electric.
3) Using the circuit breakers, shut down all the circuits except the A/C. This especially includes the convertor.
4) To keep your batteries from running down, either:
A) hook them up to a dedicated battery charger. Making sure to plug them into a different circuit than the one your trailer is using.
B) be selective. Only run the A/C during the day when it's hotter and at night turn off the A/C and turn on the convertor. You'll want to monitor to make sure you're using the convertor long enough to get a good charge and replenishing what you used throughout the day.
Note that even with these precautions, you might still end up tripping the house's 15a circuit. As a Turbs pointed out above, startup of the ac's compressor can peak to 18a, which will trip the breakers (if it peaks that high).
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