RE: The various images of "wagon" made me realize how important context is--yes, we were discussing donuts, and crullers when Bean threw in "tractor tires"

"tractor tires" to me, are the failed re-treads of tractor-trailers that litter highways! its was the juxtoposition of the words that brought up the first image, as much as the word tractor.

Never having had much contact with tractors, i didn't think about their tires as being special, (i did make the connection in 30 seconds or so.)