Wheels are a key part of any movable chicken coop, except for some of the very smallest box-style chicken tractors, where one end can be lifted and the rest dragged along the ground.
Ensure enough clearance for your terrain - bigger wheels for bumpy, uneven ground, and smaller ones for level, short-cut grass. Wheels that are too big will allow birds to slip out from under the bottom frame as you move.
When you move your hens across the pasture, go slowly and watch for any getting caught under the back of the frame. Ours do seem to figure out to walk along with their house.