Why do GY Marathon's have a bad rep? Some thoughts:
1. They're fairly easy to come by and a recognized brand, so many people use them. That makes the likelihood of a (non-statistically-significant) failure being described on here more likely.
2. People exceed their rated speed capacity of 65mph, plus see above.
3. People exceed their rated load capacity, plus see above. (Keep in mind that the weight isn't necessarily distributed evenly to all 4 tires.)
4. People don't air them up properly, plus see above.
5. Sometimes tires fail for reasons that have nothing to do with any of the above, such as being punctured.
BTW - all of this also applies for the other Chinese tires. For nearly all of us, our trailers came with some version of cheap Chinese tire, so the likelihood of someone reporting a failure is high, even if the actual rate of failure is relatively low, and many new trailer owners don't know about the above limits (especially the speed rating).
