We have too many pred's to free range here, also. Here's our Bantam Silky "tractor". We, I mean Skip, moves it manually right now but one of these days we'll actually add wheels to it. We should have ripped the pressure treated 2 x 4's for the frame into 2 x 2's and it would be easier to move.
We have 5 Silkies residing in there at this time. I made the cattle panel, "day-time only" run so they'd have more room to roam.