We clear all the ditches on the 400 foot drop, half mile driveway with a blade. We can pivot our blade in X, Y, and Z axis in addition to using the top link and the lift arms. We manage to clear the ditches.
Our blade is all manual adjust so we work in small areas, set the blade, do our thing, adjust the blade and repeat in the next area... It takes the better part of a day to run the ditches and not mess things up.
Last year, we added using our new stump bucket to help. Many times we would have a pile of debris at the end of the ditch that needed to be cleared. With the stump bucket, we can straddle the ditch and then clear the very end with the bucket - leaving an open end for the water to get out and away.
With a good crown, we keep the water flow to the sides of the driveway and the erosion down the tire tracks to a minimum. Keeping the crown is also key for our hill.
We're still learning how to keep things working well on this hill.