What is the cargo capacity or range of a grain-hauling semi trailer?

Depending on the size of the trailer and the commodity,1000 to 1200 bushels or 60 to 70 thousand lbs is a good avg. Some haul 100,000 lbs if the frame will take it. If hauling wheat, that would be just over the 1600 bushel range. Legally though, 50 to 52 thousand lbs without a special permit.