IF the upper bunk is original, then, yes, it will fold down to make a backrest. There are small hinged wings on each end that bend to conform to the curvature of the shell.
To lower, turn the little crescent-shaped cushion at the front of the bench (the "banana" cushion) onto its long edge- it will store behind the backrest, giving it a comfortable angle for sitting. Remove the bunk posts and let the upper bunk swing all the way down until it rests on the fiberglass
bench. You may have to pull the main bench cushion out of the way. Replace the bench cushion in front of the now-backrest. The bunk posts can be stored on the little ledge under the window behind the top of the backrest.
Once you get the hang of it it takes less than a minute to set up or take down. If my directions aren't clear, there should be a video on the Scamp
website. Other than a few details of hardware, Scamp
wisely changed little from the original Boler
design. It's very clever, way better than the fold-down upper cabinet arrangement in many stickies that leaves the occupant smashed up against the ceiling.
As to weight, I've heard anywhere from 80 to 120 pounds. The higher number is what Scamp
told a recent buyer of a new trailer, but there's nothing official in the literature. I tested the bunk in my Scamp before I let my daughter sleep there. It felt solid under my 160 pounds, though I don't plan to sleep there myself. The ledge that supports the front edge can become weakened in an older trailer because of leaks
in the front window, so that's something to check.