Hi Jerry,
yes my cargo bays come out with the roadside slideout. So the hyd cylinder is for the Roadside slide, but you have to go into Curbside storage bay to see the mounting point. In my last photo (view from inside the curbside storage bay, that cylinder end/mount shown is right above (next to) the fresh water tank as you noted. But still easy to get to if needed).
I'm not having any problems with this slide - just providing pictures and info in the event it might help Steve with his question.