I can't be sure, but I highly doubt that the guys on the line ever see who the truck is being built for. Most modern manufacturing facilities I've been in would assign a build number (production order, if you will) to each vehicle and that number would contain all of the information (config, etc). It is usually has a barcode and as the truck travels through the plant the barcode will tell the operator/machine what parts to pull, what engine to use, what color to paint it, etc. Some of the most modern plants skip the barcode altogether and simply have carriers that "load" the information electronically when it pulls up to the next assembly station. I don't think the guys building the truck would ever have a link back to the person who ordered it. The attitude most manufacturing managers would try to instill in their operators is that it doesn't matter where the product will end up, it has to be within spec every time.
That is kind of why I started this topic, deep down I just get the feeling that the UAW in St. Louis might feel a little more red-blooded American connection to their product. I mean no offense to the fine people who work in Saltillo, I know that the trucks I've seen manufactured there are of the highest quality.
I personally always dream of spending the weeks my truck is being assembled in the back of the bed, yelling "this is my truck, do a good job OR ELSE!" LOL! I might get some of that patriot blue on me, but it would be worth it