I bet @Kris5902 could tell you about her tractors. Aren't some coop tractors and some just day tractors? I don't remember. But anything you could make to be secure is going to be heavy. My prefab (but you have to assemble it) Omlet coop and tractor is metal and plastic, it was really expensive and weighs 300lbs, but it rolls okay [EDIT: I can pull it fine, no tractor needed]. It is pretty secure, I did add hardware cloth around it and child-proof tabs and things around the access points. It has a skirt around it against diggers.I would not let her free range without supervision. There is no way to create a safe environment for her. Unless you built a tractor that you need a tractor to move. Even then the fox could dig its way in.
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