Most tipper bodies were calculated according to what the expected load would be, but, of course, some contractors wanted universal loads.
If the body was sized to carry stone (or sand or gravel), then woodchippings and sawdust would bulk-out before the weight was exceeded, so greedy-boards were fully justified. You often see them on vehicles that carry scrap, as, although steel is heavy, scrap items might be things like bicycle frames with large voids, thus reducing the density of the load.
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