Swamp Molly's Pickup
In the season 1 episode Swamp Molly, the title character arrives at the Duke Farm in a battered 1941 Chevrolet 1/2 ton pickup.
The pickup makes a second appearance in Deputy Dukes, where it's driven by an unnamed character.
The pickup's third and final appearance was in Mason Dixon's Girls, when it can briefly be seen in the background at the bad guys’ distribution center.