Many scales use transducers that convert the mechanical force on a sensor into an electrical signal. The measurable electrical signal is then translated into weight units and displayed. I'm surprised there aren't trailer hitch mounts that have a similar sensor that'll give a reading of the tongue weight. A rectangular sensor inserted into the structural steel of the hitch can measure compression on the bottom and expansion on the top and output the readings to a display on the tongue. Tongue weight is an important safety aspect of towing and I'm surprised none of the big manufacturers implemented something similar.
Thanks for coming to my TED Talk...
Thanks for coming to my TED Talk...