Good question and I have wondered the same having neither. One thing I have found with portable generators in general for powering air conditioning is one needs a rating at least 2x of the expected load to be safe that it will work since two AC units of the same specs actually will have different requirements. I expect a lot of that is due to voltage losses due to the different RV wiring plans/specs. We know any RV with a break box that gets warm means a voltage drop is in play. The starting amperage of AC units is such a wild card it seems. A wire connection at the breaker switch that is not idea due to age or design can be a show stopper for example.
