On another forum, a lot of people seem to use
http://mayberrys.com/honda/generator...ngenerator.htm
for Honda generators
If a single Yamaha 2400 will run your a/c at your altitude that may be a good choice.
Otherwise a pair of Honda 2000s, or a single3000 either Honda or Yamaha.
If you have a lot of time, go over to
www.rv.net and spend the entire weekend reading about generators for rvs.