Thanks to everyone! I've received such great, insightful feedback and have decided on pairing two Yamaha 2000. This summer has been so hot in the northeast that running the AC is crucial to comfort.
Although this was a generator question, I love how it morphed into a discussion about holding tanks and dumping!. For that, our friends will let us use their house, so I won't need to be concerned for this particular trip. But nevertheless....
Best to all,