Had something like that in my first trailer. Never proved useful.
They (2 hinged brackets) carried an extension to the kitchen counter. While it proved somewhat useful during mealprep, the shelf was in the way at too many other times. It was abandoned and eventually removed. I think it may be in my pile of RV spares collecting dust in my barn/shop.
If I can find it, would you want it?
TT 2015 19RD "TheJayco"
TV 2003 F-350 "Montblanc" - Housebroken chore truck
Sitting in The Cheap Seats.
And proud of it!