I wonder how hard it would be to disable the interlock that prevents an electric car moving whilst charging. Then a simple trailer or bike rack style mount for an off the shelf generator plugged into the normal car charge circuit. Easy to attach, a bit of hacking on the interlock but that may be software only. Then you have a useful range extending device made from readily available and replaceable components..
Buy the model that runs on the fuel you want to use, diesel, propane, etc. It would also be able to be used as an emergency power supply for your house. Used to get your car to a camp site and then used to power the camp site.
Take the generator out of the trailer and you have a useful trailer.
Each component would be useful beyond just its use as a range extender.
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