2ty
3 of my 4 valances came loose, they were 'fixed' twice under warranty but the screws just won't hold in the thin paneling. Why they are attached that way is beyond me, it would have been so easy, during construction, to glue a small block behind the panel to give the screws something to bite into.

I'm considering doubling the number of L brackets and using new holes.  Any other suggestions?
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sunvalleyjoe
Wing nuts might do the trick. Had to do that on our Jayco to hold up TV bracket. They gave us plastic anchors and they fell (pulled ) out good luck. GBA!!SVJ
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2ty
Wing nuts (aka toggle bolts) would work but the 'toggle' falls into the wall if you ever need to remove the screw.  The other option I considered was the common expansion bolt but they tend to strip out and then can't be removed.
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