Lazygardener, this new tractor will be on wheels. The school was throwing out an old "jail" (I guess it was used for a spring carnival or something). It is basically just some 2x4 walls that make a 7'x7' cube. We'll have to spend some money for a roof, but the wheels we had lying around.
The wheels are maybe 8", no innertube. Ours are not going to retract. I plan to have hardware cloth around the base which continues out onto the ground. On our other hoop coop tractor, we lift the hardware cloth skirt with a couple wires when we move it, so it doesn't get hung up on the ground, so I imagine this will be the same approach. No idea how these wheels will function yet. It moves now, but there is no weight on it yet.
The wheels are maybe 8", no innertube. Ours are not going to retract. I plan to have hardware cloth around the base which continues out onto the ground. On our other hoop coop tractor, we lift the hardware cloth skirt with a couple wires when we move it, so it doesn't get hung up on the ground, so I imagine this will be the same approach. No idea how these wheels will function yet. It moves now, but there is no weight on it yet.