Which supporting actor has appeared in the most western shows and movies combined?

As of my last knowledge update, veteran actor James Arness is often recognized for his extensive work in westerns, particularly for his role as Matt Dillon in the long-running TV series "Gunsmoke." While it's challenging to pinpoint a single supporting actor with the absolute most appearances, other notable actors like Jack Elam and Slim Pickens also had prolific careers in westerns. Their filmographies include numerous guest roles and supporting parts across various western shows and movies, making them significant figures in the genre.