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Actually, this might be one situation where human->generator->battery/motor->wheels series could be useful. Much easier pedal setup, the generator can be bi-directional for even easier pedal mechanics, and you can top off your battery while stopped, and use a 12v motor for low speed maneuvers with or without the pedals (including reverse). +1 with trolling battery upgrade. It won't be as efficient as mechanical, but the peak exertion should generally be much less if you recharge while stopped.
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