Yes you can extend it a couple of feet to use it as a rain block for the door. We do it quite frequently (we have a Dometic awning). The only consideration I'd caution you about is that the awning, in a partially deployed position, may be higher than the sidewall awning rail, so rain may flow "TO" rather than "AWAY" from the trailer. That's something you'll have to determine based on how far you deploy the awning and how yours is mounted to the trailer sidewall.
Even with a partial deployment, I wouldn't leave the trailer and go any distance without retracting the awning. Wind, thunderstorms and damage can occur with little or no advance warning, so being prepared is always a "good thing".....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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