In case anyone else runs into problems and discovers this thread, here's what I found...
The pocket doors in our trailer do not have the 'lift and remove' style that is common on many sliding doors, and that many above mentioned. These pocket doors have rollers that run inside a track, and the door is removed from the rollers themselves by releasing a latch that is holding the door onto the roller via a 'peg' that is mounted to the top of the door. This latch, however, could only be accessed by removing the facia piece above the door opening in order to access these latches.
I'm currently in the process of trying to track down the exact part for the roller (it is bent, which I'm guessing is why the door came off of it in the first place), but it is not a difficult repair. It's just not one that can be done without removing the trim that blocks access to the latch system.