Unless your ratchet strap is in the middle of the awning, and I have no idea how you would do that, you can't bend the tube. Now if you decide to go crazy ratcheting it tight with a strap attached to each end of the tube, you could literally pull the support arms off the trailer or bend the arms.
Or do like I did.... I ratchet strap from the ends of the tube back to the trailer frame on the front end and the trailer wheel on the back of the awning. My mistake was I did this before putting out the living/dining room slide. When the slide got put out it bent the arm on the awning.