Just about everyone here has replaced their OEM tires. Some sooner than others. Some replaced them before they left the dealers ()
Hate to point you at threads but there are several hundred here on how and why. Use the "search" menu item on the GREEN menu and search for "tire" "China Bomb" etc.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
Since I use my trailer for work and always travel with it loaded I have upgraded tires starting with my first toy hauler back in 08. I put on about 24,000 miles a year.
My first hauler came with Goodyear Marathons and they self destructed shortly with sidewall failure.
I replaced with Les Schwabb Gladiators (China YUK) 225-75-15 load range e. I am now on my second set. I am hoping that I am not jinxing myself but not one blow out or any other problem. Will be going to Oregon in August and will replace again. Up there you can purchase these tires for under $85 a piece.