This was something I did several years ago to spread free blacktop down my 350 ft driveway.
I Just made 2 ft sides to bolt on my rear scraper blade effectively turning it into a boxblade, then bolted the angle iron skids about 3 ft long near the bottom front of the sides and welded another 8" piece of angle near the blade at 90 degrees, with a torch cut slot and bolted through near the blade, to allow up and down adjustment. This is a crude version of the blacktop spreader boxes we used. it worked OK but of course left skid marks in the blacktop that had to be touched up by hand. It was much better than trying to do it with a blade as the skids eliminated the dips and dives. It does require good judgement in placing somewhere near the right amount of material on the ground or dumping in small piles, driving over them and pulling them along then touching up where need be.
I saw one of the sides in the garage this year so if I can find it will take a photo and post it.
This could be done with any blade such as snowplow or loader bucket as all it does is hold the blade a given distance above the ground to give a consistent depth.