Why is this unit attached to the main landing gear not a common unit for towing or pushback?
I think it might not have enough clearance for smaller aircraft, while a towbar would work with pretty much everything.

Also the force you apply needs to be pretty much the same, independent from where you push/pull, as you only need to overcome the rolling resistance of the landing gears. The airframe and landing gears are sized for much larger loads, so there is not a lot of saving in my opinion.