I have a couple of questions.
If you plug the RV into electric power do you have power, 120vac and/or 12vdc?
Since the generator still cranks, the 12v from the battery is still connected to the generator, so something happened to the connection from the battery to the rest of the RV. Is the battery and/or the generator in the slide?
There could be fuses or circuit breakers in the connections between the battery and the power panel. They should be checked.
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