Just heard back from Goodyear and they are paying the full amount to fix the fender and bracing that the tire ripped up when it blew, and paying for 75% the tire as well.
myredracer to answer some of your questions. The date code on the new Marathons were 19/13 & I bought them the middle of July, 2013. So they were made in early May, couple months old. Actual weight, Keystone spec sheet says 12,500 shipping & 1763 carry capacity for a total of 14,263. I scaled at the cat scale at the Pilot in Ft Myers last spring before leaving Fla. The trailer was 10,900 & the pin was 2,600 for a total of 13,500. That was leaving Fla after over 3 months & you leave Fla with a lot more "stuff" than you brought down with you. Also this was the 4th trip to Fla with these tires. "Should not hit potholes" I certainly agree but show me 1 person that drives that has not hit a pot hole. You can add bridge expansion joints to that thought as well. But there is no way around it.
Not sure where you got the 15% on load capacity & axles? Where does that come from. If you have 6,000# axles, you can bet the manufacture has a built in safety factor on the 6,000# so why would you need another 15%. Another 15% off the 6,000# is 900#. So are you saying 5,100# should be the limit on a 6,000# axle?
And psi, if you read my original post I explained that I adjusted the psi the next morning when the ambient air temp was 30 degrees higher than when I departed.
I did everything I could to maintain the tires, ie not speeding, psi at 80, covering them & moving them periodically so as not to flat spot them & still had a blow out.
Bottom line Goodyear stepped up and paid & I am not sure if other tire manufactures would do that with 4 1/2 year old tires.
Thank you Goodyear....