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The three factors that affect a car's towing capacity are power, braking and weight. Power and braking you can handle on the trailer end, but weight (specifically, the frame and mounting points for the hitch) would probably be an issue. Even if you perfectly balanced the trailer to have little or no tongue weight, a too-heavy trailer might still tear off the rear of the car if the weight shifts.
How much weight are you thinking about hauling, and are you talking about the Commutacar specifically? Does it even have a solid metal mounting point?
As for a pusher trailer, maybe one of those truck-bed trailers? Keep the differential and mount the motor and batteries underneath the bed. It already has brakes and running gear, and those things are always running around, so the cops won't give it a second look (unlike, say, the rear of a Beetle hitched to your car.)
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