For him, its occasional. He's retired, and mostly only half logs for me, and himself. Paid by the hour, too.
He has steel stakes roughly 2x4, made out of 2 welded 2" square tubes, with a flange to keep it on top of the bed.
Wood bed, so he can have boulders loaded by excavator, and dump without destroying a metal bed over time.
He has 2' metal sides for brush hauling. Might make sense for me to make fashion 4 full plywood sheets that will hook to his stakes for greater capacity, and solo dumping.