The reason we developed the wheel system was A: to allow the coop to sit flush on the ground to keep larger predators out and B: to keep the smaller birds in. But we found that with the wheels engaged, the smaller birds would head for the light under the edges. To stop that I took old inner tubes, cut them to the right width, and firmly stapled them to the bottom side, inside. When the coop was lifted by the wheels, they fell down, blocking the light.
Hope you get some bigger wheels on the coop. Using rollers seems a bit labor intensive.