On the JK hard tops, is the mounting surface flat? Or is there a lip that extends downward toward the outside body a little bit? Reason I ask is because I might be buying a used hard top and I am trying to figure out how to transport it on my utility trailer. Will the hard top sit flat on a hard surface with the bolt holes touching the ground, or will it be sitting on a sharp edge because of a lip that possibly runs around the bottom edge of the top? Is this question confusing?