Check to see if the RV builder put any major items under the bottom bunk. We have had a couple of bunk rigs, one we looked at one time we liked, turned out to have the main electrical panel built in to the side of the bunk, a deal killer on that one. Lifted the bottom mattress and plywood and there were wires going everywhere .
Our current fifth wheel, by Rockwood, has a slide out bunk room where the bottom bunk is a thick mattress that sits on the floor and the top bunk is hinged to the back on the outside wall. It tilts up to about 45 degrees and locks in place. We bought it with the idea of some day putting a desk in there for an office, if and when out two young grandsons tire of camping with us. LOL