Our seasonal site is directly across from a farm. We get a breeze all the time coming across the farm. Our power awning would get pushed around so we bought a set of
awning tie downs by Camco. For $19, they worked great even through a few gusty storms with winds up to 25 - 30 mph. Our power awning did not come with the wind sensor either.
Towards the end of June this year we had a Macroburst storm with straight line winds up to 85 mph (only a thunderstorm was predicated, no warning for high winds so I left the awning out). The awning moved a lot, but the springs allowed the awning to move slowly and softly. The springs got completely stretched out and are no longer usable. The awning has been retracted and extended a few times since and is fine. A $19 investment saved our awning.
Without the springs, the Camco system is not as sturdy. The straps loosen too easily, so I am going to replace their straps with regular ratchet straps. I also like the idea 57 Panhead linked to and might give it a try.
Last night the NWS was predicting Severe Thunder Storms and heavy winds so I brought the awning in. We barely got any rain and no wind. I sure wish I could be as wrong and the NWS always is and still have a job.
-Michael