It's a 2000 model M-24QB with one couch slide out. This makes me curious if there is a switch somewhere I'm not seeing for the slide. But for sure, there is a hex shaft sticking out about an inch or more from the bottom center of the slide and if you turn it, the slide operates. I can't find a lot of info on it and the owner's manual that came with it is of no use for this...
I'm headed home tonight and will try to take some pics before we leave in the morning to see our brand new granddaughter and begin the spoiling process this weekend.