There was a show in the 90's with a guy who drove a semi with a car in the back. I believe the semi and the car were both black. He was kind of a crime stopper. The guy was younger with dark hair and ice blue eyes. Can you help me! And it was not B.J. and the Bear!

Sounds like Knight Rider

Could be the short-lived 1988 TV series The Highwayman (http://en.wikipedia.org/wiki/The_Highwayman_(TV_series)), starring Sam J. "Flash Gordon--AH AHHH!" Jones.

Knight rider?