IIRC, “Mr. Drucker” was also on Green Acres w/”Arnold” and his posse.
That’s where I knew him from. I saw most of the “Green Acres” eps in reruns on the Family Channel back in the ‘80s. “Petticoat Junction” was harder to find in reruns, so I’ve seen few eps. They once mentioned the zip code for Hooterville which I traced to the Bluegrass Region of Kentucky. I always thought the places seemed more like Oklahoma to me (or the San Joaquin Valley in CA, for that matter).