new released invertor generater

Hi Colorado! We are at and will be camping at pretty high altitude. I want to avoid buying two genes because I bought the wrong one. But I also want to avoid over buying for a 8000btu ac. Im guessing with altitude 2800watt gene is the sweet spot. Is it me or are those hard to find at a good price. And then... I gotta wonder how much im going to be using this big expensive gene just to power 19 ft. trailer air conditioner in the rocky mountains :)