... either way, only I would put a wood board between the jack and the concrete block. If you leave the dolly wheel on, I would put a small amount of grease in it. I have had mine rust on during winter storage. It's not a problem as far as damage is concerned, but I had to pound it off with a rubber mallet in the spring.
This is a great place for novice (and other) questions - keep them coming. I find this forum very helpful. No matter what question I asked, someone always had an answer I could use.