Ugggh.. i just lost my reply.. forgive me if I'm short with examples..
Anyhow..
I was not aware of being able to use them at stock height.. So... You say there is more than enough caster adjustment left to get the alignment where someone needs it.. i don't disagree.. However, by doing so on a stock truck, isn't that going to put someone further out towards one end of the caster spectrum?? I mean if they had to for whatever odd reason, roll the cams full tilt positive without tuning into the bumper?
What about in a scenario where
they are running an unconventional wheel setup & have the alignment dialed in where they want it but are getting raped by the front bumper, your not always going to want to use your castor as a means to move the axle back as it's going to mess your alignment up.
I'm not saying your advocating using the castor for that reason, im mearly stating an there's a few different issues can where a set of adjustables will be more use than a solid arm.
Now if we're talking about a perfect world where the person is running a tiny negative offset on a 9in wheel or a positive offsett, then yeah, everything should be just fine with a set of solids.. but not everyone wants or even likes a 9in wheel, ya know what i mean?
I'm just saying that there are benifits in certain situations to having adjustables.