I use only a tractor because i don't want to deal with bedding.
It has 2x4 sides and bottoms, the bottom is open, and 1/2 hardware cloth around. I'ts heavy, but my wife and I move it every 3 days with 8 hens in it and 2 boxes, a 5 gallon watering system and a 2 gallon food system.
I keep it in rotation within 40 yds of the house and haven't had an issue since.
I had 1 coon get in, but that was our fault for not locking the hasp lock with a lock one night.
Since we move it all the time, we check for dig marks and set traps as needed.
My next enhancement for easy moving to extend the back there 3 feet, put a lift top on in 2x4, and create a 2x4 twist lock system to lift the coop up on each side then move it like a wheel barrow with 2 wheels. The rear wheels make a high lift to move situation but works great on level ground.