Wow... talk about a misleading marketing name! I had to go look that up, thinking Chevy was putting both
traction control and
stability control into their trucks, which would indeed be a high-end feature.
But no... "StabiliTrak" has nothing to do with stability control, it's just GM's lame name for plain old boring traction control.

I'm sure that if argued in court, they'd be able to point to some small proprietary feature that justifies not just calling it Traction Control, but it doesn't appear to be anything significant.
Some cars, Cadillac actually pioneered it decades ago, have dynamic viscosity fluid in their shock absorbers to provide stability control by instantly changing the stiffness of the shock absorber on each wheel. Mercedes worked with Billstein to develop another similar technology, now sold as the DampTronic, and used in AMG cars from Mercedes and SRT cars from Dodge. It would actually be useful in a pickup truck to limit body roll in corners or to stiffen rear shocks when load is increased through towing or hauling, but not a cheap upgrade on already expensive heavy duty suspension.