Does anyone remember the name of the company that the Kingfish had to go to work for? I believe it was a company selling shoes. The company song was "As we march from door to door, Let us sell them more and more." I think he might have tricked Andy into taking over the shoe sales.

The episode you're thinking of is: Superfine Brush Co. Sapphire got Kingfish a job selling Superfine brushes door to door. Their jingle went like this:

Superfine, Superfine
Favorite Brush Of Yours & Mine
As We March From Door To Door
Let Us All Sell More & More
SUPERFINE!!!!!!