Thanks guys. I saw one that Bee made that had several chicks standing in it. Thought the long kind would be good so everyone would have room but hoping to keep them from stepping in it. But the plastic seemed like it might be light weight for big chickens. Maybe I could screw it on the ends to pieces of wood.
You can always place a piece of wire mesh over the top until they are big enough that they don't want to stand in it.