I bought a set of 10-inch wheels and added them to my new Snap Lock coop so that I can roll it around the yard. I'm going to build a run, closed in on 4 sides with wire, to keep the chickens safe from predators. Haven't figured out yet how to secure it to the coop.
The coop is on a base made of 2x4's. I drilled through the 2x4's to attach a rope pull, which I enclosed with some 1-inch clear tubing from the hardware store. The rope is knotted on the back, and the tubing makes for a comfortable grip when pulling. I put a pull on both sides of the coop.