Rockford Files was actually on at the same time as Dukes, but on the NBC outlet we got from Rochester, NY (WROC TV 8). Our CBS outlet at the time (via cable) was WHEC TV 10 from Rochester as well.
Dee Snider says he’s a jerk.
Ah, okay, that explains it. I wonder what followed the Dukes? I guess it was the local news and then maybe Johnny Carson.