Agree. I owned a LOT of Marathons. They all failed in short order. At every replacement, I upgraded size and load range.
LOL...that brought back some painful memories about my dealing with Goodyear over their Marathon issues.
When I was young and dumb I let a car tire shop down on the corner talk me into letting him setup all my trailer with the new and great 15"/16" Marathons all made in the USA back then. There were five trailers involved with 28 tires on the ground. In this type of work we can run 60k-80k miles a year so non had time to sit around and rot.
Well long story short after 5-7 weeks myself and my other drivers was changing a ruined tire on just about every trip. I even had two spare per trailer. We were using Goodyear replacement warranty every week. Goodyear finally stopped replacing them under warranty.
What to do.
Finally a very experienced Goodyear truck tire dealer that had lots of commercial customers made me a deal on switching all my trailers to a LT tire.
WOW....that move saved my small hauling business. With LT tires we could actually run 40k-60k miles till the tread bars showed...and zero issues. This type of work we can't afford using a tire with 8 or 9/32nds of tread depth. And we use the same size axles/15" and 16" tires and wheels as on any rv trailer.
One thing I notice RV folks may brag they never had a issue with a ST tires in bla bla years never say how many miles on their tires. Most say they timed out...which tells me they don't tow much in a years time.
Hell I have a utility trailer that sits probably 10 months out of a year with ST tires with 2610 DOT build date code. Guess I could brag no issues in 10 years also. But then thats not all the story.