Honda EU 2000
The EU2000 will run my air conditioner on low here at the house (5230 feet, near Denver with high altitude jets), with the eco-throttle off (really bogs down for a bit, otherwise), but I'd not try the microwave at the same time. And at higher altitudes (think thin air), it'd probably take at least the Yamaha 2400 to run the air -- maybe more. As mentioned above, a pair of the EU2000 (or a pair of the 2400s) with the parallel kit should handle even that, but you're looking at just under $2000 (best price I've found) for the EU 2000 pair and the kit, and the Yamaha is higher priced (20+ lbs heavier each, too, as well as more bulk).
Of course at 7,000+ feet in the Rockies, you're not likely to need air very often.
It might help to realize that a single EU2000 (at sea level) is rated to run about 1600 watts continuous (the 2400 goes to about 2000 watts) so add up the power requirements of what you want to run simultaneously to determine what capacity you need.
Note that while you can get more powerful generators more cheaply, they're bulkier, heavier and very noisy, plus the power may not be clean enough for computers and, perhaps, TVs to run without damage. And the noise from the cheaper units is not something you want in the wilderness.
Oh, yes -- a further comment on the "thin air" mentioned above: A non-turbocharged engine loses power with altitude. Even the best of normally aspirated (non-turbo) engines, at 7,000 - 8,000 feet won't get more than about 75% of rated power, and many get even less.
So go to the dealer to look at the units, figure how much storage space you have for a trip, try picking up and moving the various units, and see how it pans out for you.
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