Have a buddy looking and he asked me this question and I didn't know if there was a way to tell without looking at the sticker. I've never seen one without it
look under the front of the truck and locate the front sway bar. There will be a rubber boot mounted vertically attached to it. If you DON'T have KDSS, this will not be there.
I would take a picture, but it is dark outside. Instead I am going to steal Harper's picture...