Thanks for your reply Remy.
We are currently using a small type of motor/transaxle that does the job but is limited in the tasks it can perform. They are used as a helping hand around larger properties, hobby farms etc., to do tasks like taking the bins to the road and back, towing a polly trailer for clean-ups and collecting wood, checking mail, and just getting around the property quickly.
We have a few on our 40-acre property here in Australia, and I could not go without one now. Just need more power and the frame doesn't allow for a larger golf cart transaxle. So have been exploring options.
The current motor is brushed DC and rated at 1500W, putting out around 80Nm of torque. The hub motors we have ordered are each rated at 2000W and put out 165Nm torque each. I just figured this would be more than enough, but to be honest, the only experience I have with hub motors is on the dual-hub electric off-road scooters we use here all the time. I really like brushless and was impressed by the power of the scooters to get us around including the steep hills we have on our property. The small ATV size cart we use is pretty light and uses lithium batteries.
Ah well, if it's no good then at least I tried and will have to start looking at building a new frame which I was planning to do further down the track.
Will let you know how it goes.