This is the photo of that Rooftop A/C that she linked to
and it should need ONLY 120 VAC from a Shore Tie Cable or a Generator, to run on.
We had an old Holiday Rambler, not quite that old, and it had a separate breaker panel for generator, with a breaker marked A/C. Never quite understood the relationship, just wanted to mention that it seems there's a breaker, or a connection, somewhere that you have missed.
It seems to me, that a connection didn't get made up, in the RV, where Shore Tie Cable (the one you replaced) meets the interior coach wiring.
