I came up with this idea after having trouble straightening my driveway with just the plow. The box is the hot ticket for getting the gravels back where they belong and filling in all the ruts created by the water.

I just welded 4 tabs to the rear edge of the blade, then cut two sides out of 3/16" steel plate and welded in a 3/4"x3/4" front brace. The "box" attaches with 4 bolts and works awesome. I strapped two 12" cinder blocks to the rear rack for extra weight since my driveway is up a hill. There’s a pic at the link below:

700 with grade box
or
http://www.geocities.com/sgmiller_mcp/DSC01250.JPG