I have had mixed results with chinese made trailer tires.
I ran chinese made 12X4.80 boat trailer tires on my jon boat trailer for far too long, probably 12 years with many (really many) trips from South Carolina to Lake Okeechobee, FL. and back. Probably 1400 or more miles round trip including travel while at the lake. Last year, while at Lake Okeechobee, I noticed the tread was gone on one tire and the other did not look much better. I realize they were far beyond a reasonable life expectancy and it was my own fault for not replacing them years earlier. Still, they lasted a long time and had many miles on them. The boat and trailer are stored under a tractor shed out of the sun. Luckily, I carry two spares with me on long trips. When I returned home, I bought two replacement boat trailer tires at Northern Tool and when a local tire store mounted the new tires, they replaced the valve stems as well. Hopefully good to go for several more years but not 12 years. The only 12" boat trailer tires I found to be on the market are all chinese.
On the other hand, I had two tires on a 7x20 equipment trailer come apart last year and they were less than five years old. The trailer was about five years old at the time but how old the tires were is unknown to me. I realized that the two tires which failed were on the side of the tractor shed where the setting sun hits them while the other two which did not fail were on the side which is never in direct sunlight. I ended up buying chinese tires as replacements due to cost compared to Goodyear tires.
Not surprisingly, I think direct sunlight played a significant role in the deterioration of the two tires that failed.