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Here is my chicken Tractor.
I love the water bucket idea, that's exactly what I'm planning to do.
Great tractor. I wish something like that would work where I live, but we have too many predators.
What kind of predators do you have? If you have racoons it would probably be a good idea to reinforce the sides of your tractor with some 1/2 inch hardware cloth. Your tractor design is great and the chickens seem to take to the nipple waterer.