Well there's the intended function. Towed quack diggers or field cultivators were meant to break up sod or help shake up plowed ground.
Cultivators were meant to uproot weeds between rows. But the 3pt hitch rear ones could do some quacking too.
We would routinely change the spacing on the Dearborn 3 pt cultivator and use it for quacking or field preparation. Within the limitations of a 9N it worked fine.