We have a Bluegrass song Called" Tired " and we call it the Casson song .years ago people here called tires Cason's .
Are you sure people weren't saying "casings" instead of "Cason's"? A "casing" is/was a term referring to tires, or the main part of a tire.
Here's the dictionary definition: "The supporting framework of a pneumatic rubber tire, without an inner tube or tread" or, the "carcass".