Hmm
They're actually called concrete mixers, not "cement trucks." Cement is the, well, cement that binds the aggregate together: sand/cement/water = concrete, just as flour/water/salt = bread. You buy a bag of cement, and you use it to make concrete.9 cubic yards of concrete in the charger of a concrete mixer approaches the maximum weight the rear axle can bear legally. New models have an additional set of wheels that swing down behind the truck and is held down by hydraulic pressure, which distributes the load over an additional rear axle and allows the truck to carry more liquid concrete— 11 cubic yards or so.Don't forget "being down in the Doldrums" to describe an emotional state.Jeff