wvmarle:
Consider a linear actuator in that case, may be the better tool for the job. There are linear actuators with location feedback. Some can even be addressed in a manner similar to servos.To measure the force needed attach a spring scale and start pulling, see how much force you have to apply to get it moving.
The issue with a linear actuator is that you cannot move them manually.i would not be able to use the handle bars. I woukd have to use joysticks to control the machine in a record mode. Which would give me less control over the machine.