Currently have LRD Marathons and have been great. Will be replaced at the end of next season after 5 years of service. I like the idea of the Endurance tires, but they aren't exactly a direct one-one replacement.
Marathon LRD in 15" is 225/75/R15 with max. load rating of 2540 lbs, is rated 65 psi max and requires a 6-7" rim width.
Endurance in the same 225 width forces you into a LRE tire with 80 psi max. Rim width is still 6-7" and load rating increases to 2830 lbs.
If a person wanted to stick with tires rated for 65 psi due to rim max. pressure rating, you'd have to go with 205 wide tires. The max. load rating drops to 2150 lbs which is significant. On a dual axle trailer that drops you from 10,120 lbs to 8600 lbs. You want more reserve load capacity, not less.
For those that started with rims that were for LRC tires and 50 psi, and they upgraded to LRD which requires 65 psi, they might not be able to go up to 80 psi to get the 225 wide tires if that's what they currently have depending on their rim's rating.
I don't to have to downgrade to skinnier 205 wide tires and a substantially lower reserve load capacity. Not sure why Goodyear did it this way. Maxxis on the other hand is a direct match for LRD 15" tires and has a 65 psi max rating and at this point is what I'd use. Marathons appear to be no longer manufactured as they aren't on GY's website.
Herd mentality IMO is also all those that jump on the bandwagon declaring blowouts are due to the country of manufacture. Heat is what destroys ST tires and how many actually observe the 3 main ST rules - never tow under-inflated, never tow overloaded and/or never exceed the max. speed rating. Without an accurate documented history of tire's treatment (basically impossible), it's pointless to blame the tires.