I have a chicken ark with only 4 hens. I don't need a 5 gallon, or even a 3 gallon, waterer as I change their water twice daily. Also, such a large waterer takes up their roaming ground space in the run area. Their feeder is mounted on one end wall. I would like a hanging waterer so that the tractor stays mobile without me having to move the waterer separately. A hanging one also doesn't flatten the grass which I want the hens to enjoy. I cannot locate a 1 gallon waterer that hangs!! I have read numerous complaints about the Little Giant 3 gallon plastic waterer, and I may end up with this one unfortunately. I see Little Giant makes a metal 2 gallon one. Is metal or plastic preferable for a waterer? Thanks for any help.