That looks like a Carefree of Colorado awning. I have looked at the same zipper screen as a solution cause mine is so high and I could not lower it enough to reach it from the ground.
On your picture if you operate the awning, at least on mine one end of the slot can be accessed.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
2017 GMC Terrain (future TOAD)
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