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I've thought about building a complete stand-alone EV propulsion system (batteries, controller, and motor) onto a small flatbed trailer that I could hitch up behind my car and whose electric motor would power the trailer's wheels. It could be charged up at home (or on the road by regenerative braking) and would propel my car in low to moderate speed city and suburban driving. I would control it wirelessly via an R/C controller and actuator, so there would be no dedicated EV wiring in the car and I could hook it up to any of my cars that had a trailer hitch (the trailer would just have the usual tail/brake lights connector on it). It'd be a way to get EV capacity without having to build a dedicated EV vehicle.
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