Help!!! It's hot and have electrical issues :)

Back to the gensets. Sound like they went into overload mode. Is fridge and water heater on LP mode? I would try to determine why gensets overloaded vs. debating feasibility of using AC on 15 amps circuit.
There is no one size fits all answer for the 15 amp issue. How long of a cord , what gauge cord, what else is on the 15 amp circuit,what is the current draw of the AC unit at start up, what other items are on in the RV, will all be factors