Middle buster would not work, since you would have to be so far off the road to straddle the ditch.
If it's leaves and branches, I use a blower that runs off the 3 point hitch. Works great for most of the time. To re-cut the ditch or make them deeper, and off-set rear blade works wonders... both of which are not cheap. They both also work better with hydraulic top and side tilt cylinders so it can be directed into the ditch.