Since I urbandock a lot, I chose to add two auxiliary shore power cords. I use a system of male and female plugs to break out the water heater and the converter. Each of the added shore power cords have additional outlets that I use for powering heaters in the winter. It would be just as easy to do this with the power feed to a second air conditioner.
If there are enough shore power outlets that gives me access to 45 amps which is ample power.
For RV parks I made a break out box for fifty amp to a 30 amp, and two twenty amps each with their own breaker.
This allows me great flexibility--I can even run the generator to supplement a single 15 amp shore power source.
I can go back to the oem wiring in about 10 seconds.