A inrush current capable clamp-on ammeter would quickly answer a lot of questions about (a generator's) inrush current capability. This is the current necessary to start an inductive load like a RV a/c or residential fridge, compressor.
A few years ago we took two Honda EU2000i's (solo and paralleled), an EU3000iS, and a Champion 3100 inverter, and checked inrush current with the eco mode on and off powering a number of RV a/c units (13.5k and 15k's with LRA's of 50a, 63a and 70a). The Champion 3100 had the highest inrush current (by far), followed by the paralleled EU2000i's. Surprisingly, a solo EU2000i had almost the same inrush current as the EU3000iS. It's easy to establish a good baseline with whatever appliance you're testing by checking the inrush current using an outlet with good commercial power first.
All the anecdotal reports I've heard/read about the Predator 3500 inverter generator seems to show it has excellent inrush current capability. It might even be on par with the Champion 3xxx inverter generators which have a very high inrush current capability. The only significant negative with the Predator IMO is the difficulty obtaining parts for it through HF. Their MO is simple replacement, not repair.
BTW, manufacturers typically rate the "surge" current capability of a generator over a period of several seconds on up to 30 minutes. This is very different from inrush current which is typically measured in ms (milliseconds).
