If so how many per year, and what types/companies?
Yes, US export automotive to China for many years. These years US automakers chosed to localize their products in China and only export high-end products to China now.
If you have interest on this topic, I suggest you a website: gochinaauto.com

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The US does not, but Ford, GM, and Crystler do.
References :
Yes, US export automotive to China for many years. These years US automakers chosed to localize their products in China and only export high-end products to China now.
If you have interest on this topic, I suggest you a website: gochinaauto.com
References :
http://www.gochinaauto.com