I have never seen corrugated on a real dump truck- only on little pickmeup trucks. Which is not to say it doesnt exist....
But on the little trucks, 1 ton and under, its usually quite thin, 14 or 16 ga, and in several pieces, each only 18" or 24" wide. In newer pickups, its a one piece stamping. In neither case is it made from a commercial pattern of corrugated- its a custom made part for the auto industry.
I would want smooth, not diamond plate, for a dump. And diamond plate is usually 1/8" or thicker, especially in steel. Which adds a lot of weight to the bed.
The corrugation on commercially made pickups is a way to use the least material, at the least cost and weight, and still have it stiff enough for average "half ton" usage. A beancounters compromise.
I think 1/8" plate, with a decent web of beams underneath, would be better for a dump that was intended to carry any amount of weight.
While there may be fab shops in Maryland that would make you custom rolls at a reasonable charge for their plate rolls, around here, I can imagine that asking a shop to make a set of 3 four foot long, 6" diameter rolls with a matching pattern on em would run somewhere between 5 and 10 grand setup charge, at a minimum. And most regular plate rolls dont have the daylight needed to open the rolls enough to add a big profile roll- they are designed to adjust an inch, at most.
Rolling corrugated is a specialty, that usually requires big, heavy, specialised rolls. Even for just rolling the 24 gage they use for metal roofing, its a big machine. To roll 12 gage- you are talking meat, and meat equals money, to misquote Morrisey.