The tower is very rigid. At one point at the NH kickoff there were three kids hanging on it, and not gingerly.
Its really hard to tell from the photos/drawings, but there are solid metal plates below the tower & the bumps that help keep them solidly in place. They are mentioned in the rules:
Quote:
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The BUMPS are fixed to base plates that are secured to the carpet of the FIELD to keep them from moving. The base plates are covered with the same carpet as the FIELD. Note that this forms a small (approximately ½-inch tall) transition from the FIELD surface onto the base plates.
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I dont see it mentioned, but the same style plate is underneath the Tower. You can sort of see it
here.