matt:
The OP took issue with the current quality of tires, I am curious of what your assessment is over these last couple of decades regarding overall tire quality. I would have thought the overall quality would have increased for all sizes.
Also, it seems you are suggesting that you should always balance trailer tires, if for nothing else other then to look for the ones with too much runout. Given that shops do not let you observe anymore, I am thinking my new process for all tires, including trailers, will be to tell the sales guy: “If it takes more than X ounces to balance the tire, I do not want it, please change it out with another.” Do you think this is a good idea? How would your shop respond to such a customer request?