That is a great question, however, it is a question which we do not know the answer to.
Without having the manufacturer's specifications for a specific hub motor that is not a question which we would be able to answer. We would presume that an electric bike or scooter's hub motor would be able to handle the weight of one rider and the vehicle itself though. When a scooter or bike is going uphill most of the weight is on the rear wheel, and when going downhill or braking most of the weight is on the front wheel, so the individual wheels should be made to support the full weight of the vehicle and rider.
Karl Ackley