I'm not an engineer but, I do know what is hazardous and not enticing to generate support for an electrical item, and that is not having to plug it in or have battery acid spilled all over you during a collision. Maybe, even a small one. Another problem is the inefficiency of gearing. Such as; driveshafts and differentials. Get rid of them. I have seen a company in the Netherlands that has reversed the concept of a generator. The rotor has become the stator and vice versa. Making the generator into a traction motor. Not only could this become the source of power to the road and eliminate the need for gearing but generate possibly more energy. This all could be run by a Natural Gas or propane powered generator. Quite green, very effiecient and long lasting. My problem is I haven't the knowledge (or time and energy left) to work this out. But, Iknow one thing if you think you are going to entice people to want to use your elctrical vehicle forget it if you have to plug it into the wall or roadside or whatever and wait for it to charge-up. It ain't gonna happen with the general public.
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