You notice that the trailer mfj.s don't use "no-name" bearings and
seals from the beginning. there's a reason for that. No one else should
either.

Unfortunately many do. Big Tex and Lufkin Industries have both
switched to Chinese as have many others. My trailer is a McClain and
it came with General (Chinese). It scares the dickens out of me to
think of all the trailers running down the road at 70 mph on junk
bearings.