I purposely went with raised hutches for lots of reasons.
A colony I figured they would dig out. Have we got kits, which hole are they in. If I walk in will a collapse a tunnel or nest? Do I want to bury wire and how deep do I have to go.
In a hutch I know who ate, how much, whose drinking, how much, I can see body condition. Look them each in the eyes. Easier to provide shade, weather and predator protection. You gonna put wire or netting over the colony. Red tail hawks, owls your out west Golden Eagles.
Tractors sound great. It's on the ground now you're bending. Hot and sunny day, is grass under a tree or out in the sun. Neighbors dog, cat, is at Tractor height. Scare them to death. Night time now there's opossums, raccoons,foxes, dogs, cats, rats.
How many tractors you going to build. How long is your good grass available. Are you home so you can watch for problems. Starts raining or snowing can you move them out of drifts or puddles.
Local man kept bobwhite quail in a flight pen. Figure a huge tent framed and covered in netting. Twice he had to release hawks caught in the net. Had to fix the net both times. Hawk shredded it getting tangled. Second time he went to the hospital cuz the hawk shredded him. Neighbor and I were standing at the mailbox talking. He had an ancient miniature poodle on a leash. From behind his house out of an oak tree a Cooper's hawk swooped down at his dog. Dog saw it and flinched, hawk turned off at the last second. Old guy only saw the dog move. Until I pointed at the hawk flying down the street. Never made a sound. So with people standing there he still tried. Envision your rabbits unattended in a colony.
Lots of bad can happen in hutches. I worry when hurricane's come. I'm not home all day nor would I likely hear an animal trying to get in. I do have a motion sensor light but after 10 pm I'm snoozing. My hutches are built heavy, not easy to move solo. Dog can't knock them over easy. Under a cloth carport blocks off hawks, owls. Wooden boxed end gives them some where to hide. Even added a board to sit on for added sense of security.
You ask about them trying to get out. I have never scene an animal, any animal that appreciates confinement. They might stay home but they want out. You can build the biggest pen in the world and one will still pace the edge wanting to get on the other side.
