I had a 2000, West wind 5er with a 24" deep crank out, couch slide .
If you check the forums and look for the number of power slide issues, being reported daily, you will find a number of RVers who wish for a manual slide, or at least a usable manual back up.
I've read the instructions for manual deployment / retraction of my power slide, and it's something I'd never want to attempt.