'dem things ought to be STANDARD! On the other hand, they are a pain in the butt! On the first RV, I had to replace them twice, fortunately, I was still in warranty period. On my current RV, I have had all replaced. Dealer did original ones, Les Schwab (west coast tire chain) did the replacements. Haven't yet had a problem with the ones Les Schwab installed.
If you do a lot of travelling in small towns in the West, always good to get your tires at Les Schwab. I remember when I had a job where I travelled a lot, my co-worker said, "Get your tires at Les Schwab, because there is always going to be a Les Schwab in every one of these #$%# little towns we have to go to!"
JJ