I've been thinking about this for my countertop in the galley when I get that far along in my build. The curve on the back of my trailer is sloped enough that the counterop edge will be several inches forward of the aft floor edge so I would like to bring it out closer to the edge to feel more like a regular countertop.
The link to leevalley.com above didn't work but I dug around there and found this Parson's table fittings. The pictures are small and I wish there were more (or even a video). Was this what you meant to link?
http://www.leevalley.com/US/hardware/page.aspx?p=41856&cat=3,43586,43594This is the kind of mechanism I have been considering but would like to learn more about so I can design for it.