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Here's what Greg Fordyce had to say:
The way I understand it, amps gives you torque and voltage gives you rpm. 500 amps through a motor will give the same torque at 12 volts as it will at 120 volts but the rpm will be 10x higher at 120 volts. So if you want ~500 amps through the motor at 3000 rpm then you need to double pack voltage. Or if this is not possible shift to a higher gear so motor rpms go down and allow more torque (amps) through motor.
So your choices are more batteries or a gearbox.
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