An AC motor is far more efficient, powerful, and maintenance free (No brushes to wear out). Some carts sold in TV with AC motors:
E-Z-GO RXV
E-Z-GO TXT 72-Volt
Yamaha PTV AC
Tomberlin
Star Magellan model
ParCar Mainstreet model (Saturday morning cartoon cart
)
The Tomberlin, Star, ParCar can be registered for road use if you want. I recommend the Tomberlin LE model but test drive them all. Why pay $12K for a gussied-up Yamaha when you can have a Tomberlin LE for $11K?