Jerry,  did you get your slide issue resolved?  
The reason I ask is my coach began doing the same thing, driver's side front slide inching out as I drive.  
There was a hydraulic leak from the slide cylinder.  I had the cylinder reworked.  The cylinder no longer leaks.  But now the slide creeps out while I drive.  
The tech, having worked on the cylinder, is aware of the hose connection to the slide cylinder.
Curious if you found the solenoid/manifold to the slide cylinder.  Did you replace your hydraulic line?
Thanks!
Paul