One thing that really makes difference on my Kimberley is how you have spreader bars that support and stretch the roof taught. You first run few out from the trailer to a few of the upright poles, then you have additional spreader bars that go between those at 90 degrees. They have hand wing screws on them so they are easy to lossen, slide out until the canvas is taught, then tighten the screw clamp to hold them in place.
Once installed, they add an amazing amount of rigidity in the wind and rain. As long as you are working with a rectangle, you should be able to easily design spreader bars to keep your awning taught in stormy weather.
One other thing KK did well was to have 6" springs on all the guy ropes. When staked out, the prings do a nice job flexing when needed in gusts and then pulling back taught. Nice touch if you want to carried away with the details. :elkgrin: