How many existing birds?Thanks for all the feedback and reassurance. I also realized I forgot some important information...when I said the tractor would be in the coop, I actually meant in the run. Our entire coop/run area is predator-proof and the big girls sleep outside in the run right now (they moved out there at some point when the weather got hot - I'm in GA - and I've let them stay there figuring they'll go back in when it gets cold) as we never close the pop door, so I sometimes think of the entire thing as the "coop".
It would be tough to fit the tractor in the actual enclosed henhouse part without it being under a roost and I would hate to see what would happen if the big girls DID decide to go back in now that the weather's getting colder. The tractor's about 2x2.5' and 2.5' tall and we only have 2 chicks. It's just a wood frame wrapped on all sides except bottom with chicken wire. This is the coop we built, with some minor mods (not my pic):
I will get a pic of our actual coop with the tractor later.
How big is that coop part...about 3' x 3'?