We had this issue on our 2007 Adventurer.
Turns out the screw heads failed (snapped).
It is a 'known' possible assembly issue on some late 06 to early 08 builds, and generally is handled at minimal to no cost - unless there was obvious owner damage/lack of maintanance. Search the forums, its not common, but it happens (popping screws).
I did a temporary fix on ours by carefully predrilling & screwing through the rail face in a couple spots. It held fine, but still had the factory do it right while at a GNR.
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Bill & Dar - Fulltime
2015 Grand Tour 43QL pulling a 2013 Avalanche Z71
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