Aluminum chicken tractors. Predator proof, light weight, integrated feed and water. Move them onto fresh grass twice a day and your chickens will stay healthy, clean and safe. Asking $1500 each. They each hold 25 full grown meat birds and are 5x10 ft. These are great quality and not available new anymore. More info here: https://www.backyardchickens.com/threads/metal-chicken-tractor-from-murray-mcmurray-review.802226/