I thought that the black material is a hard nylon type of plastic that is there as a wear surface to protect the railing. A type of flat bushing.
If it's getting pushed out, looks like the bed rail is causing binding in the wall railing, pushing that bushing like material out. Perhaps the wall railing is shorter than others, not distributing the weight of the bed rail, and putting more weight on a spot, pushing it out.
Perhaps that black bushing, flat material could be screwed at each end of the wall railing so that it doesn't push out? If a screw couldn't be used because of contact, perhaps and industrial adhesive could be used.
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2024 Black Jeep Grand Cherokee L Altitude 4WD, 121" WB, 3.6L, 8 speed, Blacked Out Package, 265/50R20 wheels, 6,200# Tow Rating, pulling a 2020 Rockwood Premier 2716G Pop Up, with a 14' box. Go through Indiana Dunes NP 5X/week! Previously had 2012 Jayco Jay Flight 26BH and 2008 Jayco Jay Flight 19BH Travel Trailers. Also previously had 2007 Starcraft 2406 Pop Up with 12' box and bathroom, Previously had 2005 Rockwood 2290 Pop Up with 12' box and porta potty cabinet.
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