[Mikendebbie]

Ceiling panel sagging in the slide? Wow that is a new one on me.
This question is probably worth posting to a separate thread titled “Slide ceiling panel sagging”…you might get better feedback rather than leaving it in this thread about reattaching wood trim.

Below is a screen shot from a Keystone Montana factory tour showing the slide edges. It looks like the roof is a sandwich panel. I would think that brad or pin nails would not bite too well if shot into the insulation between the framing members. I would assume the framing is aluminum. I would get a stud finder and try to located the framing members and decide if the sag can be reattached along the joist. I think the panel is glued to the framing in the factory. I am stumped to come up with a re-attachment method that will be totally invisible. Maybe someone here will be able to provide better advice.