Anyone?
Here's a real nice Chevy:
https://www.youtube.com/watch?v=VF2lg06Xfh0
I don't know if it has the factory lower pain line, but here's a rough description of this truck:
:14 mark, LH fender: The line appears to be center of the lower molding.
:31 mark, RH fender: The line appears to be above the center of the lower molding. Ha, maybe this isn't a good example. Hard to tell with pictures sometimes.
2:46 mark, rear fender well: The line appears to be above center of the lower molding
3:33 mark, rear bed: The paint line is above center of the lower molding. It some configuration of the upper portion of the molding. Then again, as mentioned above, I think it's supposed to match the paint line on the tailgate.
Probably make more sense to me using a string line.