We use electric fencing here, or at least we did.My first generation chicken tractors were built with 1" chicken wire held on with staples to the wood frame. One of the top doors was wire and the other tin, the back half was tin. I also run 3 hot wires around the base with a half joule solar energizer. It worked great for two years only lost a couple of birds to the coons.
This spring I had my last two backup holland cockerels in one to keep them safe during a time of heavy predadation. The coons jumped up and down on the lid until the staples failed, ate the birds, then tore a hole in the wire to exit.
My upgraded tractors now have 2x4 welded wire attached with pipe strapping and all of the chicken wire has been covered with 1/2" welded wire. I've also replaced the poly hot wire with galvanized steel. Yup they broke the electric wire on their way out.
Another important note, I quit using staples. I use screws and fender washers to hold the welded wire in place. On my cattle panel hoop houses, I use heavy duty zip ties.
It doesn’t really work as a predator deterrent and just about works to contain certain livestock.