Mep1811:
I have and did my best to repair.
Placed new webbing over broken straps and used a one stitcher to sew them together. Time consuming.
This is the only way to repair since straps are sewn into the awing itself.
Seems to me that the webbing used was second or third rate; definitely...
Found these on Amazon about 2 years ago with Specter part number. That links is now gone.
Last year driving thru desert (+100F), each one swelled up about 1.5 its width. All's okay.