I am considering buying a golf cart. I have a call in to the manufacturer on how much traction force they can generate. I will fill you in tomorrow.
Golf carts typically have a 36 volt dc motor rated for 53 amps. This is a series wound motor and has lots of torque at low speeds so it should be good for the task.
I fugure I will have to beef up the suspension to handle the tongue weight. Details later.
At least I can run around on it in the yard.