I agree, it's hard to narrow it down to six.
Some of my favorite TV shows growing up were:
The Dukes of Hazzard
Mr. Wizard's World
American Sports Cavalcade
Truckin' USA with Ed Bruce
OK, here's another six:
The Undersea World of Jacques Cousteau
The A Team
BJ and the Bear
Oh, and any Tex Avery, or Hanna-Barbera cartoon.