I am opting for asphalt pads because if there is ever any reason to dig under that area they are easier to break up than concrete pads. I have concrete streets in half the park and will finish out the street in concrete. I think adding 20x20 concrete pads is just too much concrete if by any chance a pipe goes underneath it or tree roots etc. We are just finishing replacing all the water lines in the park and installing submeters but I am not upgrading the sewer lines at this time so I will go with the lowest amount of concrete possible.