The sticker in the door jamb is the 'manufacturers statement of certification". Because GM Assembly didn't install seats, bumpers, or road-worthy wheels and tires (these componets are all part of safety compliance) these vehicles could not be certified by GM as being in "compliance with all federal and state safety standards as of date of manufacture." That's why the "incomplete" designation in the VIN. (The "D"). After PAS installed the safety stuff, THEY had to certify it as being in compliance.
I wasn't there, but I'm pretty sure these trucks ran, and were complete, other than trim items, when they got to the end of the line. There's no way GMAD would tolerate dealing with building a hand-full of trucks that didn't run and drive under their own power, on a line that also has to build 75-100 'regular' vehicles per hour. I don't think PAS did all that much.
My brother is actually at Flat Rock now. But, yes I was relating experience at Oakwood.
Regards,
Dave