The Schwintek slide system is most often used on the smaller, lighter bedroom slides.
I usually look at pictures of the slide, looking for the shiny aluminum tracks on the side of the slide near the top and the bottom. Those tracks are what you see on a Schwintek.
Look at the first picture of
this slide on a Montana. Do you see the shiny tracks?
On edit: Correction, according to others the shiny "thing" in the linked picture above is a cable. I was seeing the cable and its shadow, making it look wider. So, when looking at the side of a slide, I need to distinguish between an aluminum track (Schwintek), an aluminum cable (cable slide) or nothing (regular electric or hydraulic slide).
Now look at
this one. No tracks visible. I think Silverback uses hydraulic slides.
Here is a closer look at the Schwintek tracks so you know what you are looking for.