X2 on the poor reputation of Goodyear Marathons. Have had one blow out just sitting there over the winter, and another with a bulge in sidewall - ready to blow. Another marathon on a car hauling trailer that belongs to my boss recently blew a chunk out of the sidewall while hauling nothing but air. Personally, I would not recommend marathons to anyone. Goodyear automotive tires seem to be OK, however.
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.