What about a midmount blade? Since I have gointo old Farmalls, I have seen them for grading and also moving snow.
It seems it would be less senstive to bumps and dips than a scraper hanging off the front or rear.If you hit a bump 2" tall with the front tire, the scraper should only move 1" vertically, right?
If the scraper is hanging 2-3' off the back of the tractor, and the fron tire lifts 2", then the scraper on the rear has potential to drop or cut 2" deep.
I'm guessing this is right, or else all the big road graders wouldn't have the blade in the middle.
RobertN in Shingle Springs Calif