4000 watt Generator with A/C vs 1500 watt Gen without A/C???

I have a Champion 4000/3500 that we use regularly at GNCC races where noise is not a problem. My next purchase is the Champion 2000 inverter for when the ac is not necessary. I wouldn't hesitate to get the 2000 inverter and you can later, when finances allow, get a second and parallel kit. No complaints with the Champion.