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I was thinking the same thing.

Depends on the material and how big a tractor he uses.. 4 cubic yards of loam weighs about 12,000 lbs. Sand is less than that by a little over a thousand lbs as moisture content is mitigated. Also this weight is being dragged and not lifted so at any given time, material is lost and gathered which makes the weight fluctuate.
The lightest material being loose top soil but 4 yds of that is still approaching 9000lbs but an 8000lb tractor should be able to manage that.
Snow on the other hand approaches around 7000lbs. Dry clay is about 3000 lbs less than loam for 4 yds give or take.
The gathering blade on a Cat D 11 is purported to carry over 50 yds of material at any given time.
Now that's a lotta weight.

 

[MtnViewRanch]

My LPGS is 7' wide between sides, 8' long and 22" tall. The tractor without a 3pt implement is over 12,000lbs.

You can see that material has been over the two support bars. This is with the material being with an ideal moisture content. When it has been wetter or with grass mixed in, it has without a tail gate pulled the implement full of material.

For me, this has worked very well at evening out (moving high areas into lower areas) acreage up to about 5 acres in size. As has been previously mentioned by sandman2234, the LPGS moves more material than a box blade (my BB happens to be rated at 1 CY) without a tailgate.

So yes, 4 CY with a tailgate and the LPGS is by far more than a one-trick pony implement.