Do you just want to be able to run everything, or do you want to be able to run everything at the same time. If the former, a 3 KW generator will (just barely) run everything you have. A 4 KW would give you a little cushion.
If you want to run both A/Cs, and the microwave, and some other stuff all at the same time, then a 10 KW might do it, while 12 KW certainly will.
Retired electronics engineer. Avid paddler & birder.
2011 Silverado 2500HD, diesel, 4x4,crew cab, 8' bed
Palomino Puma 253FBS (27' 5er) & '94 19' Class B