It is probably for the drape "roll up". Bed drapes can usually either be pushed to the side, or rolled up towards the roof. Our 1007 had removable plastic splines in the bottom hem for rolling up. I am guessing these align with some sort of attachment point for holding the drapes out of the way.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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