I love the idea of a chicken tractor, but we have coyotes and foxes around the area. If I do not install wire under the tractor won't predators be able to dig their way under the tractor? If you install wire on the floor how do you move the tractor without harming the chickens? The only thing I can figure is to not attach the floor to the bottom of the tractor and to build an additional one the same size. Then I can just lay the floor on the area I will drag the tractor to and place it on top of it? Any suggestions?