Tongue Weight Rating

skipnchar wrote:
IF your truck has a maximum tongue weight number assigned to it it would be without any weight distribution system attached.---

His truck has TWO maximum tongue weight numbers assigned -- one for "weight carrying and one for "weight distributing".
The 895# value to which he refers is for "weight distributing".

---If you try to figure it WITH the WD in play then you could keep adding spring pressure and pretty much carry ANY sized tongue (but the rear wheels would eventually be clear off of the ground.---

Why should the OP even attempt such extreme loading of the WD bars?
The Owners Manual clearly states the WDH should be adjusted to cause the front end to return to its unhitched height.
That would cause about 80% of the tongue weight to be carried on the TV and would cause about 20% of the tongue weight to carried on the TT's axles.
As for raising the rear wheels clear off the ground -- even if the OP had 1200# WD bars and could load them to 200% of rated load (which probably couldn't happen due to bar deflection limitations), the load removed from the TV's rear axle would be about 2000#.
That might reduce the load on the rear axle from 4000# to 2000# -- tires still on the ground.

It's really unfortunate some hitch manufacturer, about 45 years ago, created a TV/TT combo which used only the front wheel drive TV's front tires and the TT's tires to carry the entire load.
The TV had a relatively low rear axle curb weight, the TT probably had a very large negative tongue weight, and the WDH probably was specially reinforced with oversized WD bars.
Nevertheless, this silly example keeps being resurrected and posted as thought it has something to do with actual towing situations. Unfortunately, it usually serves only to confuse people who are trying to understand how a WD system works.

Ron