Are you talking about a cable operated slideout?
If so it is a BAL system. The cables are under tension by using springs. There is a panel on the inside of the slideout on top with a piece of trim over it. You take the trim off and you well see the springs and motor.
Here is a video on them. The presenter is talking about replace a broken cable but it well show how the system works.
Also here is the BAL manual for them
http://norcoind.com/bal/downloads/ac...ice-manual.pdf
Hope this is what you are talking about and it helps you out.