Interesting stuff. So many of the newbies I trained came up with the idea, but I was told by some engineers that such systems were not terribly accurate since the stiffness of the oleo compression action would cause it to stick until the force was great enough to 'jog it'. Ultimate accuracy required zero friction.
But for the purpose of red-flagging serious discrepencies, I suppose it has its merits. I always thought big pressure pads strategically located at holding points near the threshold would have worked, but cost and durability would be difficult as would persuading every airport to install such a system.
I still think well trained and experienced load controllers are the way to go, even if such systems are used to back them up and reduce obvious errors.