Which generator?

I've had my ac running for many days at an rv park no problem, the only time I tried running it from my buddy's place (with a 50 ft extension cord) it ran for a few minutes then tripped the 20 amp breaker in the house and the one in the camper too at the same time. I think next time it only tripped the house breaker. I did not have my meter to verify current draw, and still don't, but we'll be in texas next week and I'm going to need a generator

I was looking at the yamaha 2400 but it's only 2000 watts? I figured 2400 would have been enough, I didn't want to step up to a 3000 if i could avoid it- at that price would 2x 2000 watt Honda parallel be better?

Any reviews of the briggs & stratton power smart? The price is right but for longetivity I have no idea