I am on your side, I think you make a good kit and the original poster or anyone else shouldn't be worried about using it.
I also think this is a good discussion about what matters for changing wheels or axle parts and what to think about and look for.
Understanding the original or ideal design considerations helps evaluate effects of changing the relationship of parts, and at some point if changed enough it does matter.
...The dual hub wheel mount is significantly out board of the single hub wheel mount and doesn't seem to have created a bearing load issue The front tread is almost 3/4" different on stock axles between dual and single rear wheel, and again all other parts are the same.
So i'm thinking that if it were a problem all 3800 and up dually trucks would already have the problem...
The dual wheel trucks use different wheels with lots of offset compared to the single wheel.
Making the center of wheel again in approx same location relative to the wheel bearings, so not an issue at all for bearing load.
Different matter,
It's true the kingpin is not in the center of the wheel. And that the wheel turns about an axis defined by the center of the kingpin, like a hinge turns about the hinge pin.
The kingpin is inclined, and that incline lets the pivot point of the wheel on the ground (the kingpin axis extended to the ground) come close to center of tire tread on ground.
So changing wheel offset will move tire contact patch on the ground relative to turning point on the ground.
Big changes like some of the 4x4 crowd with extreme outset wheels makes a difference, harder to steer, more tire wear because of more scrubbing when turning.
If driving dead straight all the time this wouldn't be an issue. (Not considering wheel bearings)
