First upgrade might be more 12 volt deep cycle batteries in parallel with your main battery for more battery capacity.
If you are thinking generator, the main thing to think about is if you plan to run your air conditioner (about 2000 watts) on the generator. If you have a policy of "If I need air conditioning, I need electrical hookups" then you can get away with a much smaller generator like the Honda 2000. That will be enough to run your next biggest electrical load, the microwave. Of course it can also run all of your smaller loads like converter TV, and even the water heater, when the microwave isn't on. If you overdo the electrical loads, the Honda will simply shed the load (and you will have to go outside and reset it). You can flip breakers/switches to lessen the loads while you use the microwave.
The Honda 2000 is QUIET, light, fuel-efficient, and expandable (with a 2nd 2000 and the parallel kit).