Found this over on classiccar.com and I left my opinion on what I thought they are...see if you guys concur with me or not:

GMC cab pics

Last edited by patrick66; 10/15/2008 3:55 AM.

Pessimist - Sees glass as half-empty. Optimist - Sees glass as half-full. Gov't- Sees glass and takes it from you because you have a glass.
Political Correctness: A philosophical belief system bereft of common sense and logic, that supports and rewards ignorance and stupidity.