Install a second unit
That is what we did immediately on our 2015 30.2. We had a 29 footer before and no way could that keep cool, so we knew going longer would only make things worse. We did not want the expense of upgrading service panel and generator, so we can only run the main unit with the generator, but we can run both with onshore power. We carry a 50A to 30A & 20A splitter to run them both from a 50 amp, or can use a 30A and the 110 receptacle on the electric post. That second unit has been a lifesaver.
It sounds like you might have purchased a unit ordered for rental, but never put in service, instead of the regular model, thus the missing upgrades.
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