Daveinfl,
Like others, I run my load range E tires at 70 psi, which still exceeds the load rating that I need for my loaded 3124KS. I would think 50 psi might be a bit low, even for your 2619.
I'm most intrigued by your photo. Most trailer tire (ST) blow-outs (not caused by external puncture) are sidewall failures. This was clearly a tread failure, which could be caused by manufacturer's defect (many horror stories about Marathons) or excessive heat due to high ambient air temperature and high speed. Just out of curiosity, what speed do you drive with your TM?
Dave
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