Didn't your bunk hinges have an "L" on the ledge side? Mine have something like that from the factory. It kind of lifts the bunk kind of "up and over" when you put it in position.
I wonder if someone had changed yours, or if some were made with just "regular" hinges?
I'll see if I can dig up a photo of mine and add it to the post.
Edited to add: Okay, this is not the best photo, but it's a crop of a large one I had on hand. You can sort of see how it works overall from this photo. One side of the hinge is made in an L shape; the other side is "normal," like you would have on an interior house door.
The L-shaped side of the hinge is attached to the ledge that is fiberglassed to the front wall of the trailer.
Here is a photo I found on the web that shows it in more detail:
It seems like the bunk might not lift "up and away" properly with just a standard hinge (?). Also, this does raise it so that there is a bit more room for the lower bunk.
On my Boler
these are the factory hinges.