I store my C rig outside, and a nice big class A is kind enough to block much of the sun on one side. A 5th Wheel on the other side isn’t as helpful so I get more direct sun to the front cab, and that’s the side I see this separation on. I noticed the bottom end was pinned down to the track. I was able to detach the bottom and re-insert the now shrunken piece of trim back in and it’s been fine since. Either it’s not shrinking any more, or untacking the bottom is allowing it to expand and contract as needed inside the track.
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