Both Maxxis and Greenball have fine trailer tires. I would feel comfortable on either. Carlisle had a bad name from years ago, but haven't heard of anyone with problems in a long time. The Kumho tires are very good quality.
Costco has 2 reasons for selling the Greenball tires. They are good quality and Greenball gives them a better deal than the other guys.
I don't discount the China manufactured tires. I have sold a lot of tires from there over the years, and just like anywhere you have something manufactured, it is all in the design specs and quality control. Some of the early tires produce in China were complete crap, but there are a few brands of passenger and light truck tires that are quite good.
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