Just an FYI, I just purchased one of the Champion 3100 Watt Inverter Generators, 75531i, and after adding oil and gas, it started on the first pull. After letting it break in a while, plugged it into my RV at 6400 feet and about 88 degrees outside temp with a 15000, BTU Air Conditioner and it ran things just fine!
Non scientific hearing test, it is a bit less noisy, (quieter), than two of the 1600 watt inverter generators hooked in parallel, but louder than just one of the CPE 1600 watt inverters.
John