Run off of an alternator?

[king_monkey@itexas.net]

Hello,
I'm new to EVs and I have a question.  I was looking around and noticed
that most of the electric cars either run off of batteries alone or have a
gas backup system and most, with the exception of the gas/electric versions
have very limited ranges.  I thought this to be a hurtful idea.  

I want to build an EV out of AC Propulsion's motor.  I looked at their
T-Zero which has this motor in it and said, "Why would you have to simply
run off of batteries?"  And what bothered me most is that if you wanted to
go further distances you had to by an unsightly (although they tried to
make it work with the cars looks) trailer that would supply you with more
power.

I thought to myself, if you can achieve longer distances with this trailer
then why can't you find some sort of device that works like an alternator
on a car to power your vehicle?

I was wondering if this would be possible and if so, how much power would
you need to produce to keep the vehicle charged while driving and running
accessories?

Any help would be great.

Thanks,
Mitchell Gray