Good call on the GY ENDURANCE Tires. Put a set of "D" tires on my Boat Trailer in 2017. I have WAYYY over 20k on them with plenty of tread left. They only get used in the Summer towing nearly every day at 70mph.
Oh yea they are US Made if anyone cares.
Heck I had a total spindle/bearing failure and aired from 50psi to 70 and towed home 60 miles at 55 on three tires with 117 degree tire temp checking them twice. Zero issue!
Thankfully I noticed the cap missing when I walked to get the truck and trailer to pull the boat of the water. Could have killed someone with a free wheeling tire and wheel!
I had just done a temp check along the way getting fuel.
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