Yep, gone are the days of bolting a piece of angle iron to the rear bumper of the HQ with a towball on it ....
Now we have reverse sensors, ABS, ESP, CANBUS, maybe even the deceleration sensors for airbags, etc are affected by towing, not to mention the super lightweight wiring that can't be tapped into.
These electronics are getting so sophisticated, it probably won't be long before the weight, no. of axles, and whether the trailer has brakes, will have to be programmed into the ABS/ESP ECU so it knows how to attempt to correct a swerve or a jack-knife.