That is for the awning. The legs that are tucked inside the end of the awning have a little "foot" that will tuck into that clip that is mounted on the side of the shell that you pictured.
After you extend the awning, you pull out the awning legs and rotate them so they will slip into the clip. To get them into the clip, you lift the movable top bar in the clip, drop the foot into the clip, then let the bar drop onto the foot. This locks the foot in the clip.
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