Equal-i-zer - shank and ball height questions

It would be best if you could get an actual tongue weight as in with a scale, bathroom scale setup or actually raise the tongue with the tongue jack only on the truck scale pad until no weight is on the ball. When you're hitched up sitting on the scale, the leverage of 5' behind the axle is going to take weight off of the front axle and put it on the rear axle. That weight isn't tongue weight. IF, theoretically, you had enough tongue weight to lift the front wheels off the ground, you'd have the entire weight of the truck on the rear axle along with the tongue weight. So the weight removed from the front axle on the truck scale with the trailer hitched needs to be subtracted from the rear axle weight with the trailer hitched.