Since I usually keep the spare wheel/tire assemblies, I've found that the spare tire well of a junker is great for filling up with low-grade small metal junk from my shop. Oil filters (drained, of course), wiper blades, steel cans from oil/transmission additives, rusted-out mufflers and things like that. My yard treats me good on my steel, cars and aluminum, so I make sure anything I "stuff" with is strictly metal. They're probably glad to see my stuffing compared to the guys who try to sneak in wood, extra tires and junk like that.
I also get plenty of excess exhaust pipe that I cut off of my cats from my core business, so that goes in the clunkers, too. The good stuff like rotors, drums, steel wheels and hub assemblies get saved up for their own load. I need to stuff and scrap a car soon, my tin pile is getting huge
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