Sunshine... like a lot of my musings, they get lost in the brain cobwebs... I got too busy with regular gardening to try this, but I did get 3 tires for my garden. I filled them with alternating layers of soil and chicken compost, and put tomatoes/squash in them. The plants in the tires are outperforming those planted in the garden. Of course, they do have the benefit of chicken compost... but... I'm so impressed with the tires that I will repeat the plan, and add more tires next year. I think Bee used a tire in her coop to set the pan of water in the winter. The tire acted as a heat sink, to help keep the water thawed. The tires, even with side walls intact would provide good opportunity to add some chicken beak deterrent in the run. (wrap the tire with hardware cloth) You could even use a single very large tire, with holes drilled in the top sidewall to attach strings around the perimeter, then to the top of a single pole set in the middle of the tire. All kinds of possibilities!