TJ I had a look at CC's pr4's after close to 3500km of straight roads from Alice, Barkly Hs and on to Bingara and they look to be wearing nicely...no squared off mark whatsoever.
He took a roos bone through the rear tyre on his return to Alice. Blackall tyre guy had no trouble getting a pr4's. had them is stock.
More than once I've been told this and that cant be got at a dealers. Only to look through their stock and found just what I was after and noticed heaps of a superseded tyres.
If I can afford it I'll buy two of the older tyre at a reduced price. Suits me suits them too.