From my readings, the Sailun is good brand regardless of where it is made. I hear the GY Marathons are problematic no matter if made here or in China, but that could be a design issue.
As for that speeding transport driver, Bon Jovi's "Living on a Prayer" comes to mind. Most tires on new RVs are Chinese ST tires rated to 65 mph and the transport speeds may be the beginning of the end for them. However, I've seen too many cases of Chinese replacement tires also having problems as well to put my trust in that generic group. At least the transport drivers are getting the blame as opposed to the we are all idiots who don't know how to check our tires school of thought.