Hello Everyone:
I have a CK35 and land in northern Minnesota. I have tried all the attachments you been discussing. I borrowed a 2 bottom plow from a friend and found that not to be practical because of all the tree roots, stumps etc. I ended up buying a sub-soiler (heavy duty) and mounted a 12" potato blade on it replacing the chisel. (Which I still use from-time-to-time) The sub-soiler works great for ripping up the roots, sod, old stumps etc. After cleaning up the roots etc. I go over it with a 60" JD tiller I purchase off of Craigslist. Over all the tiller works best for all rework applications, but when opening new ground start with a sub-soiler. I beleive the tiller will go down 6", but for my planting needs that's more than enough. I plant Clover, Rye,Winter wheat, and a few other goodies. I love my CK35.