Awnbrellas work great.
We had them on our last travel trailer with a 17 foot awning, don't need them with the shorter awning on our C.
Since you adjust the tension the fabric is not stretched.
The biggest advantage is that water does not pool and the wind does not move the awning much at all because of the slight upward bow.
When installing the camper side brackets make sure to use caulk on the screws to prevent water intrusion. Also make sure the awning is fully open when drilling the holes in the roller tube so they will line up correctly.