Great chicken tractor! I raise Cornish Cross in a tractor, but no wheels. I overbuilt the last one and wound up giving it away. I have started another one made of PVC, for next spring. The problem I had with attaching wheels is that they raise the coop high enough to allow rat snakes in and other predators to dig under. I did not take the CC back to a night station, but left them on pasture. They were in a pasture guarded by Livestock Guard Dogs. Only one of them would go after snakes and she went to the dog house in the sky last October. I moved it once or twice a day. Got any ideas on raise/lower chicken tractor on wheels?