The haradrim couldn't have brought the Mūmakil to gain an advantage against the Riders of Rohan because they weren't planning on Theoden and co. showing up. After all, just a short time before Theoden was a shriveled toad eating out of Sarumans hand (through Grima) and Saruman had his gigantic army that was going to crush Rohan. All the Haradrim thought they had to do was defeat Minas Tirith.
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