Reason for this type of tyre failure

Acorn:

patrokloscy:
So it’s just bad luck? Don’t think so mate. I have 5 trailers doing this type of work. Never have this type of issue with other tyres even with cheap Chinese

Doesn’t matter how many you’ve got, the pictures don’t show tyre failure but tyre damage, and vet you had similar damage even Chinese ones
The cut sidewall is entirely consistent with damage from outside rather than tyre failure.

To me the last 3 photos look to show a bulge just above the bead, and the scuff is where the tyre has been rubbed looking at it?
I agree with the yellow chalk mark one is damage.

A failure from that bulge, could look like the first set of photos imo.