[SkunkWerX]

David,

I hear what you are saying, but all I can envision is something like a standard rear grader blade, with a piece of channel of other metal bolted to one end, which is still going to give some sideways strain.

There is always just a plain old grader blade, tipped hard to the ditch side, so it's cutting a Vee.

I guess to minimize the strain, you would center the subsoiler/middle buster/shank just outside your rear tire and drvie as close to that side as possible?
Something ike a plow blade mounted off-set? It would pull the dirt up onto the road surface for further grading.

If you take it a little at a time, it may not be as much side-to-side strain as you think. If you try to cut a 16" deep trench in one pass, then, yes, it would probably be a concern.

Good Luck, I'm curious to see what others have up their sleeves for this sitaution?