I've had trouble with both of the sliding doors in our trailer, both the door at the bedroom, and the accordion type door at the back of the kitchen. Ours is the 31' floor plan.
The bedroom door is bad about coming loose from the ceiling as it's just mounted to the interior skin with screws. I first tried larger diameter screws, and that worked for a short while. So, I installed still larger screws along with a piece of wood under the door when it's open, or in it's pocket, to relieve the weight from the screws. This has worked for a while now.
The accordion type door is hung in a track with plastic bits, and the main outside wood piece was heavy enough to break it's plastic piece, and so would come out of it's track. My cure for that one was to make a new part out of some carbon fiber panel and screw it into the remaining part of the plastic part that was rivited to the wood piece. This is working well also. Hope all of this is of some help.
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