They may be no name to us, but can 20 billion Chinese be wrong?
There was a time when we may have been concerned about things made offshore, but there is a certain reality most in this country are afraid to face. A lot of products and product content is made offshore, and those goods are usually made to the standards our domestic goods must comply with. Tires must be DOT approved, especially for commercial applications.
The castings for your Series 60 engine block are (were) not made here. It is likely most of the electrical components in the bus were made offshore. Not a lot of the typical car we drive is made here and the tires that carry familiar names are no longer exclusively made in the US.