The Goodyear Marathon was a great tire for years but folks on trailer and tire forums swear that Marathons went bad when production was outsourced. The Endurance USA-manufactured is the tire I think Goodyear introduced to address the bad PR that Marathons were getting.
IMO many bad anecdotes about trailer tires center around folks who do two things. One is to keep on driving on five to twenty year old tires, saying that they still have plenty of tread left. Second is folks to not regularly check and adjust tire pressures at least monthly.
On my own two horse, with my tires preventively replaced every five years, I am on my second set of Kenda Karrier ST design radials. They are made in Asia, for those here concerned about overseas manufacturing and also current cost (tariff related subject). My anecdote to share is that my Kendas have never had any problems.