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Why not towable gas generator trailers that you can rent for long trips.

Hook it on, plug the connector up and attach your license plate to the back (or use eink).

Alternatively, put a battery in that trailer. See for example https://far-a-day.com/en: “Like an external phone battery, but for your car!”

Years ago I saw some one who had sawed off the back end of a late 1980s Chevy cavalier (or similar) and turned it into a portable generator trailer for his EV. This was so long ago it was probably an EV conversion of some kind.

There used to be a really classic old website called Mr. Sharkey (you can see some of it on archive.org). He was into a number of different weird and wonderful hobbies. One of them was a VW Rabbit powered by something like a 24hp DC motor and lead acid batteries.

One of the most interesting projects he did was to build a trailer from the front clip of a similar VW Rabbit, engine and transmission etc. He then used this trailer in a pusher configuration to take the electric VW Rabbit on extended trips. The engine was controlled by a hand throttle in the car. Apparently the handling was surprisingly acceptable in this configuration.

Edit - Found the link:

https://web.archive.org/web/20121105135914/http://www.mrshar...

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