I like #3, especially since that's how I painted mine,
. Good news for you, Mar-K out of Oklahoma city now makes the correct length upper trim for the suburban (I should have pictures in a week or so). Also, Rokcrwln has a good write up on making the 4th door here:
http://www.67-72chevytrucks.com/vboa...=188993&page=3.
R/