Evil Dead: Hail to the King
In Evil Dead: Hail to the King, the Hellbillies are more clearly represented (as Deadites). Ash fights their possessed selves in the game, and also finds the Boomstick in their house (Called "Hellbillyland" in the game). He also finds that particular family's Grandmother locked in the attic, who then mutates into a giant spider.
According to his journal entries, Prof. Knowby was frightened of the Hellbillies, and suspected them of stealing pages of the Necronomicon Ex-Mortis.