So
this link is not an endorsement of the company, but they have images of the fencing I wanted to mention.
I had this type of fencing around a pool I once owned. Its awesome stuff, and very durable, I think it would even hold up to Chickens. So, with this type of fencing SC, you'd only have to provide the ground 2" x 6" boards with holes pre-cut in them to accept the posts...and tada, you'd be supplying a coop with a run. Either they order the fencing, or you do...No gate required to get into the run, just unclip at one post and bing, you're in. This is what I plan on making my run out of. Some deer fence mesh from Lee Valley to cover the top and you're all set. The fence rolls up easily, the boards get picked up and moved where'ever, and you put some hooks on the outside of the coop to hold all that run stuff while you're moving the coop...