Holding down the awning in strong wind

Its me again.
Another query.
Recently we were camped down at Marlo (Vic) and horrendous unexpected winds came up about 4am. Not even the local fisherman predicted it...
Our 19' awning was flapping terribly.
Eventually my husband decided to roll the awning up.
I expect big mistake as the edge of the awning along the outer edge tore, more than a metre! The end arm also buckled a bit too!
(Another insurance claim, our second since Sept09! Hang on, I'll tell you briefly about the first claim, the 23' van lurked off the back of the vehicle about 20km on our road towards home. Fortunately my husband controlled the swaying van and eventually brought it to a stop on the side of the road. Part of the drawer bar was worn away, the front shutter flung up and cracked, a link was cracked on one of the chains. The screw on the coupling was loose so we expect that was the cause of the coupling lifting off the tow bar).

We are about to have the replacement Carefree awning installed.

What do you suggest as the best way to secure the awning in times of sudden wind (and I expect each time we roll out the awning)?
We have seen some clips which attach along the side of the awning on to the arm. (De-flappers??)
We have used webbing across from side to side...

Thanks again for reading and hopefully replying.
TandT