double down
Search the interwebs for mini cooper hub motors. A UK outfit built a cool looking Mini with motors in all 4 wheels, so there is precedence. Something like that could be put on the back of any front driver with out too much doing I'd imagine.
I've been investigating the pusher trailer idea for my bicycle, using a kid trailer a bike hub motor, and a couple 12 volt lead-acids, or maybe retrofitting a e-scooter deal. One of the reasons I like electrfying the trailer vs. the bike itself is the trailer could be unhitched and then no additional weight is on the bike, save for a couple feet of wire and a throttle. The advantage here on a car pusher would be on a highway trip you may want to leave the trailer home.
For less than what it would take to design and build a 1 wheel trailer with drive train and hitch there exists a thing that lets you tow a motorcycle by holding the front wheel on a thing in the receiver hitch. I like the idea of wiring a throttle to an electric motorcycle in tow to a throttle inside the car. Then you get a pusher trailer, and an independent EV. You could have a gas motorbike pushing an electric car too, if you already had the electric car.
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