texasAUtiger,
The "super slide" is typically referring to length, not depth. Most likely a 12ft (long) slide-out.
You're correct... it does appear to be a 24" deep slide-out, and not a 36".
Added note, simply as an FYI: 36" deep slide-out's are more common than in year's past, but 36"
isn't a guaranteed (standard) depth. Manufacturers will sometimes use the more narrow (24") one in a
light-weight trailer line to achieve less weight.
Hope this helps... and a belated welcome texasAUtiger & family!
Terri, the Chevy co-pilot