GM,
At the very bottom of the tailgate, there is a raised section about 8 inches high that goes all the way across the tailgate and blends with the lines of the fender bulges. While it apears that this piece is stamped into the tailgate sheet metal, it is not. The tailgate is actually molded fairly flat. The raised accent line at the bottom of the tailgate is actually as piece of molded plastic that is glued to the tailgate with double faced sticky tape.
The Sport Trac tailgate is the same tailgate that was used one the previous F-150 models, except they added the stick-on raised plastic trim to blend better with the Sport Trac without having to make a whole new tailgate.
...Rich