I built a similar thing like in the picture Ken posted (#15)
Mine is a King Kutter ripper shank for a box blade and a home built adapter to a receiver hitch. Mine has the shank pinned to the adapter with two 5/8" pins. So it is adjustable for depth.
Adjustable is a good thing since it seems to pull my 3pt to the full down position no matter what depth you run the shank. I suppose that is a function of the curve of the shank and cutting tooth.
I have used it to drain several mud puddles where I didn't want them. And to grub up around several tree stumps to remove roots and stump.
Never ran out of traction or power pulling it full depth, unless I hooked a root or big rock. It will just move over rocks about grapefruit size.
Good luck
Wyo
JD855 hydro, 24hp, unloaded turfs, 4x4, about 2000lb.