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A trailer generator is all kinds of inefficient. Weight. Aero. Etcetera.
Better to have a portable diesel generator you can stick in the trunk. Still won't solve the range problem without you having to stop to recharge for an hour or two. Not without some hack.
Be nice if you could wire it up so it could directly power the drive motor during a cruise. The last Chinese PHEV I drove did that... ran exclusively on the EV drive motors at low speed, so when the battery was depleted, the gasoline motor ran as a generator to run the drive motors directly (and very slowly). A dedicated compact 5-6kw generator could at least give you crawling ability when you run out of battery without costing or weighing too much.
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