As much as logic says DIESEL, logic also can also say GASOLINE.
Consider this: Frazer ambulances are designed to be primarily 115 volts, with a 12 volt converter to power emergency lighting and other 12 volt accessories. They use an Onan 5.5 kW gasoline generator as the ambulance's primary power - they selected gasoline based on a diesel's increased noise and vibration, despite the shorter generator life expectancy with a gasoline generator.
Here's a Frazer installation:
And here's the Frazer generator
Users often keep a rebuilt Onan generator on the shelf as a spare part so they can quickly replace a failed unit.
I had considered a diesel generator for my unit, but I recognized the difficulty I would probably run into trying to quiet it down enough to be allowable in a campground. I wound up with a 4 kW Onan RV generator.