'Stability' is why I got them. Early on in my ownership of this Sub I took an interstate freeway transition road with a reducing radius at way too high a speed and came damned close to rolling it. Felt like I was fully off the passenger side suspension and I was using every inch of the pavement between the paint line and the iceplant, foot off the gas, hoping I could keep it on the road long enough to settle down and reach the merge. Really felt like I was on two wheels.
I had 2" spacers (4" overall increase in track width) installed within two weeks. Had been driving Tahoes for years, the extra rear length, tired coil spring, body roll in this tired Sub really caught me off guard. I'd driven that same transition in our Tahoes many times at similar speeds. All vehicles K1500s, Z71s. But I'd put 2" of suspension height on this Sub and about 300# in the cargo area. The rear end really wanted to come around as the body roll rapidly got worse.
So now I drive it a tad bit slower in curves. Still need to stiffen up those rear springs.
Just looked it up, looks more mild than it drives. The road also isn't cambered/canted properly. Descending and off-camber. Really though I was going over, which would have put me in that slick crap and shot me across 4-5 lanes of converging traffic at about 45deg, with me on the side taking the hits.