For me what I'm looking for is the equivalent of a Bosch motor run on 24v coupled to a 2:1 reduction, gearbox.

This would have an output shaft of about 12mm a speed of about 1500 - 2000 rpm and a stall torque of about 22Nm.
this could then be fitted to a robot with a chain drive 4:1 giving a wheel speed of 400 -500rpm
I was wondering if the Ranglebox gearbox is man enough for that if coupled with a brushless motor and speed controller.

The idea is for a no frills drive unit that would be a lot smaller and lighter than current drives, but give similar performance.