How about modifying an older 4WD car, say a Subaru Impreza with electric motors on the rear wheels only or maybe even a standard FWD car with a rear drive axle incorporated in from something small, like an old Toyota or Datsun or small traction motors directly at the wheels themselves. This way, the electric motor/generator could be tied into the rear wheels while keeping the gasoline motor for the front? One could either manually control the power split or devise a simple controller, perhaps via laptop that could read various parameters and issue the appropriate commands or some combination of the two.
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