I think there are at least four different issues being discussed here.
One is awning slap. It happens on long awnings in the open position. Wind gets under the awning, billowing it out, and causing it to slap and stretch. A center support (as in Fordzilla’s link), extending from the awning roller to the RV will help mitigate that condition.
When a long awning is in the stowed position it can develop a longitudinal oscillation from one end to the other, making it sag in the center, stretching the fabric, making it hard to open and close. A support, fixed to the RV, which supports the center of the awning helps in this condition.
Improper stowing of the awning arms and a malfunctioning awning ratchet can cause the awning to swing out from the RV causing all kinds of problems. Fastening the arms can help here.
But I think the big problem that most people are seeing is when a very strong broadside wind gets between the side of the RV and the rolled up awning fabric (ronnilu’s post). If the awning ratchet is broken, or if the wind is strong enough to break or strip the locking gear (ratchet), then even with the awning arms secured the awning fabric will billow out and unroll. You need a locking device that will keep the awning tube from spinning.
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