I was watching an old Alfred Hitchcock Hour episode, and…well, if Jimmy Corrigan isn’t consciously referencing this, I’m sure Ware at least saw it at some point. It’s about two brothers who live on a peach farm and have an old pick-up truck. One goes out to avenge their father’s death, while the other, dimwitted one mostly just bites his thumb and wears overalls. It’s a good episode, anyway: here’s the link.

http://www.nbc.com/classic-tv/the-alfred-hitchcock-hour/video/episodes/#vid=917681