Based on the Dallas/ Fort Worth Design.  Our club has 4 carts that can move all 80 of our curling stones at once.  That is roughly 900 pounds per part.  The great part is that it eliminates the need to remove the stone from the cart to put in the freezer and then back on a cart to move to the rink.  We only need to lift the rock on and off at the edge of the rink.  Think about that next time you lift 3000lbs of rock.