After going through all the options and also buying the Eddie Bauer, this is what I have learned about the generator and electricity in general.
I ended buying Energizer 2800W portable inverter generator, which can run 15000 BTU A/C unit, but it needs few minutes to warm it up, otherwise it gets overloaded and will shutdown. Honda or especially Yamaha 3000iseb would have been better, but they are very heavy. Ideally generator should have been 3000W+ to have smoother A/C operation.
If I would buy generator now, I would try/go with Boliy Pro3600SIE, which have optional propane kit.
eZV2800 - 2600W Gas Powered Inverter Generator | Energizer Generators
Boliy Pro3600SIE specifications
My list of recommendations:
1. Do not even consider having built-in generator. To have it done properly, it would cost a fortune and most likely you would still end up hating the noise. It is absolutely the best to buy portable generator that you can place as far away from the Airstream as possible.
2. Do buy solar panels, I ended up buying Zampsolar's 240W kit. It works like a dream. Generator is only needed for A/C - nothing else.
3. Do consider replacing current Interstate SRM-24 batteries to more powerful ones. For example SRM-29 should provide almost double the capacity. With heavier use, batteries will run out during the evening.
4. I will have my solar panel connected to the battery, even when ”In Storage” is switched on. This is great, if Airstream is stored outside. Even when lights are turned off, Airstream seem to be consuming batteries.
5. I will have separate main switch installed inside of the battery case if battery needs to be fully disconnected (Airstream stored inside).
6. I will replace 1000W inverter with 1500W or 2000W model. This will allow me to operate microwave/coffee maker without generator. I will also have separate inverter outlet/switch installed inside of the microwave cabin.
I hope somebody else finds this list helpful.