That slide within a slide I wrote about a few days ago

 

 

 

It’s on an upscale Jayco Pinnacle model fifth wheel.  The bigger part is for the whole bedroom wall.  The smaller part is for the head of the king-size bed.  It makes for a pretty big room inside.

 

Windows, room to move around, a television, a fireplace, a couch, and a king-size bed!