It looks similar to the motor in your Comutacar - 2000 rpm would be approximately 25 mph which is about where the C-car motor (at least the stock GE motors at 48v) starts to lose torque. But it should do at least 3,500 with no problems.
You're probably right - at 600 pounds the motor won't be working too hard. What kind of controller do you have in mind?
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