When you need AC and don't have shore power, you wind up living with some kind of compromise, be it hauling a portable and gas plus cords and locks, an Onan with lots of noise and cost, or the shaky capacity of the battery and engine generator systems. None of the options are very good, IMO, but that is the way it is.
We choose not to be in the very hot and humid whenever possible, and if we are stuck, we get shore power. We removed our Onan and replaced it with batteries in that location, and added an underhood generator, but we still couldn't run AC reliably on it, and never planned on it. We can run everything else. If we needed AC all the time we would have kept the Onan, but not liked it.