I think he's asking if you can install a 4000 watt inverter and appropriate batteries, using the inverter to feed the coach (and power all the generator accessories).
I haven't seen anyone do this. Assuming this is an off-grid setup, a 4000 watt inverter and a battery bank large enough to power it (say for running AC) adds a lot of weight. It's not practical.
I have seen "solar" trailers towed that essentially are this setup - large battery banks with panels all over the place. Plug the RV into the trailer.
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