hey, So I am working on this project where Im trying to come up with a motor set up to drive two wheels of a trolley. The entire trolley weighs 650 kgs and i require a motor with a torque of about 400Nm. I want to set it up in such a way that i want to be able to apply very little force to push the trolley after which the motor takes over n it moves forward by itself. When i apply a little force to pull it backwards the motor takes over n it moves in the backward direction. I don't know how to go about this. I will have to use some kind of servo assist mechanism but I am really not sure. Also steering will be completely manual. I need only forward and backward motion. Somebody please help me!