Mate, Evie and I have an Austrack.
We have only had it about 4 months now and we love it to bits.
The quality of the canvas is fine. We have never had any problems or leaks and one trip we did, we were hit with torrential rain and howling wind. At a guess, I would call the wind gusts that night to have exceeded 50 knots.
Apart from a couple of tents in the park, we were the only camp to have escaped undamaged.
Some images from the morning after.
This last one was taken while the wind was measured at 30 knots. if felt like a gentle breeze after the horror night before.
As I said, Don't be concerned about the quality of the canvass or the rest of the trailer for that matter. Austrack quality is as good or better than any soft floor camper I have seen.
I have no commercial interest in Austrack. Just a VERY satisfied customer.