Hi,
Add an auxiliary shore power cord. Use #10 wire.
Find the Romex for the air conditioner.
Disconnect it from the breaker.
Put a male plug on the Romex
Add a female outlet on the breaker for the air conditioner.
Plug the male plug into a female outlet that is powered by the auxiliary shore power cord.
This has the benefit that you can easily switch back to the OEM wiring for times when there is only one power outlet on a pedestal.
I've done this for the converter and water heater, but not for the air conditioner. I added additional outlets to the two auxiliary shore power cords which I use for additional electric heaters in the winter time.
Be sure to disconnect the converter when running from the inverter.
P.S. I can run my roof air for a time off the battery bank and inverter. I'll sometimes deliberately run the electric hot water heater to "knock down" the battery bank so I can collect some more free power.