If the pusher was only for cruising near highway speeds, and most small cars need less than ten hp for that, then it could be set up like cruise control. the EV drivetrain controls the speed. All acceleration is done with the EV components. Once at speed the pusher kicks in to maintain speed while the EV parts coast. We don't want to regen at cruise, but on descents and deceleration only.
A small wrecked motorcycle would seem to be about right. A two wheeled trailer would introduce all kinds of dynamic driving problems like jackknifing, off center traction, etc. a puller(tractor?) would need to be steered. But a small motorcycle frame, center mounted on a strong receiver hitch just might work. Some kind of lift to pick the wheel off the ground would be nice for maneuvering and at tolls.
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