It could work - BUT, 500+ pounds is a lot of extra weight to be carrying around all the time. And if you put all the batteries in the back, your vehicle might be a little tail-heavy. You might need helper springs or higher-rate springs in the back. And watch it on the curves!
I highly recommend Mike Brown's book Convert It! as a great guide. He shows how to build an EV safely, and what he says should apply to what you're trying to do also.
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