I just cleaned out my 1951 1 ton two days ago, so this is fresh in my mind. It came out of a Kansas farm where it had been stored since 1981. The cab corners were packed solid with (thankfully dry) dirt and corn.
Under the bottom of the seat was corn cobs, sticks and twigs, leaves, turds of all sizes and shapes, skulls from unknown small animals(yes!), pieces of wire, small white insulators from an electrified fence, various shredded stuff looked like insulation, burlap sacks, brittle pieces of dead plastic garbage bags, a round cast iron piece of something that has threads on it, looks like a cap to something. There were various small pieces of wood and small rocks and stones carefully gathered and packed. I have heard of squirrels doing this sort of thing?
There were nests under the dash and on top of the heater. I have not finished yet, I could not get my arm behind the seat back (nor do I want to stick my hand back there when I can't see what is there), and the seat back is full of stuff.
