The MS series would be fine. MS2000 up to MS2800 I think would suit you well.
Yes you could run at least 2x A/C on generator and run the microwave or hair dryer off the inverter at the same time. 4x GC2 is about minimum and certainly if you go to 8x GC2 you will be in great shape.
Now I will say I am a proponent for separate components. Easier to tailor the system to what you need and if something malfunctions it is easier to diagnose and repair only what is needed. So I recommend a stand alone inverter of 2000 to 3000 watts, separate transfer switch(es) and separate supplemental charging system if needed. Not sure Magnum has such an inverter so I recommend you look at GoPower SW 2000 or 3000 watt unit.
Also I assume you have no load shed energy management that will shut down the A/C compressor when microwave or hair dryer is switched on for a few minutes. You have actually run these items at the same time to test right? Overload a few times to verify what loads work is not going to hurt the system.