Andersen wrote:
The goal of the weight distribution system is to get the tow vehicle and trailer as level as you can.
IMO, the goal of weight distribution is to restore some or all of the load which was removed from the TV's front axle. The tow vehicle does not need to be "level". Leveling of the trailer should be done via hitch head height adjustment.
With that in mind, here is the OPTIMUM setting for most installations:
FRONT WHEEL WELL: the SAME or within 1" ABOVE the initial measurement you took on page 4
REAR WHEEL WELL: the SAME or LESS than the initial measurement (but not drastically less –see next page).
IMO, suggesting that the WDH may be adjusted to make the rear wheel well height the SAME before and after indicates the manufacturer has a fundamental misunderstanding of how weight distribution works.
If the rear is the same height before and after, that means the rear springs essentially are carrying the same load before and after. IOW, no load has been added to the rear springs. If no load has been added to the rear springs, that means all the load added to the TV is added to the front springs, and that certainly would not be advisable.
The purpose of WD is to return the front end to, or slightly above, its unhitched height. When you get the front right, the rear end will take care of itself. If you don't like the resulting rear-end squat, air bags can be added. Of course, air must be added prior to adjusting the WDH.
Ron