Thanks for the input.
I don't know is about the most honest answer you can give.
As far as trucks go, I think the STA handles fairly impressive. Certainly allot better than any other truck I've owned. Doesn't hurt that I replaced every suspension and chassis component. Rides like new.
The spacers are as much for a wide stance appearance as maybe adding some extra stability.
They made a noticeable improvement on both my street Subaru, and my lifted one. And those are only 15mm.
I've ordered a set of 1.25 inch (32mm) spacers, front and back the same.
We'll see how they fit and look.
I'll post pictures and results of fit.