We put together a chicken tractor to give our chicks to keep them where they’re supposed to be. We’ll put a tarp over one half of the tractor so they’ll have somewhere to hide when the eagle come about (and a place to hide from the rain). And it’s got a low-motion swing!
We used a 1×4 for the swing and mounted the rope to both the top and bottom of the tractor. This approach leaves the swing move a few inches each way, but it doesn’t swing when they hop on and off. They seem to like it — I’ve seen each chicken hanging out on the swing today.