Get a box blade for that type of work.
But this brings up an interesting point that we might want to debate. (since we are helping you spend your money, we might as well help you make the right choice) . . .
I have 2 different box blades. The side plate profile of one of the brands is rectangular. The side plate profile of the other brand is a trapezoid. I never gave it any thought until after I got the newer blade and realized it was not a rectangle.
So here is my observation . . . the rectangular side plate is NOT as good as the trapezoid side plate, but it probably is cheaper to make. Here is my logic, when I tip the box so the front is down and the blade itself is just touching the ground, the trapezoid shape is NOT digging into the ground at the leading edge of the unit. When I do the same with my other blade, the leading edge of the rectangular side panels are now digging into the ground. When I'm smoothing the ground, it is easier to do with the trapezoid side plate.
By the way, when I say trapezoid shaped, I mean a true trapezoid that tapers from the front corner all the way back to the rear corner. I am not refering to a rectangle side plate that has the leading corner cut off about 2" back.
Anyone else ever run across this?
It may be that I only noticed it since I have 2 different blades from 2 different manufacturers?
Here is a picture of a TRAPIZOID sided box blade. The front edge of the side plate is a couple inches shorter than the back edge and the bottom edge of the side plate tapers up to the front edge.
Here is a picture of a RECTANGLE sided box blade (with cut corners at the front edge). The bottom and the top edges are parallel to each other and perpendicular to the front and rear edges.