cruz-in wrote:
Given my math, and the relative symmetry of my setup, I would have expected a higher percentage transferred to the Trailer Axles.
When thinking about the weight transfer, it's helpful to consider your truck & trailer as one item with 3 axles (front, rear, trailer). Even with a tandem trailer, they effectively act as 1. Those 3 axles are the only places that support the weight and do so in proportion to the "shape" of your setup. Without WD, the shape is free to deform placing all of the hitch weight behind the truck rear axle, lifting some off the front in return.
Once you introduce WD, it "bends" the shape up in the middle so the rear axle now sees less weight. The weight no longer seen by the rear axle will be shared by the two end axles (front and trailer). So while your setup may be symmetric when measuring from the hitch, it isn't when considering spacing of the axles. You also have to consider that some of the weigh removed from the rear with the WD was originally carried by the front so it returns there first before wanting to share onto the trailer axle.
