OOOhhhhh.
So, just as if you hooked up a travel trailer to a ball that's too high, and then lowered the ball to make it tongue down rather than tongue up, the apparent tongue weight would increase.
Load directly over rear axle, call it 90% to rear, 10% to front; BUT as truck squats it changes the load angle and causes the forces downhill from the front toward the rear.
Increase rear load and decreases front load. So every time avvidclif1 gets a heavier trailer it multiplies this effect by increasingly squatting the truck and sloping more and more load off of the front axle toward the rear.
I think that makes sense.