mechanic, I have done a great deal of this very thing, mainly because I have a 4 acre section by my house that I 'clear cut' two years ago and am not trying to clean it up. I pulled the box blade at idle speed along the perimeter in order to ''blaze a trail'' for breaking with the disc harrow.
The box blade, without the scarcifiers, and engaged at slightly below grade removed all the vegestation and small saplings and would occassionally catch a stump. When that happened, I just backed up and found a route around the stump. My end goal is to cut a fire lane and then burn the whole thing off.
The box blade working exceptionally well for that purpose.