Hi all -- Currently we have a chicken tractor which we built ourselves, with 4 hens in it. The size amounts to about 8-9 sq ft/hen outside and 2 sq ft/hen inside (they only go inside at night; we're in HOT South Carolina). We are considering expanding the size outside and building a longer run off of it, but this would render the structure immobile. Anyone have any opinions/advice on whether a mobile coop that we move every 2 weeks or so (to give them fresh ground to scratch in) or a permanent coop and run (to give them more space) is a better option for our hens? We have 1 black australorp and 3 buff orpingtons. Thanks!!