Probably for the lateral supports if you install them.
OOOH okay I see now. That does make senseThis is why. The main hoop will have 2 short diagonals going from about the height of the crossbar to the driveshaft tunnel. SInce there is no frame there, they use the plates. IF you had ladder bars or a four link, you can tie it to the front crossmember of the ladder bars.
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