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From the Honda Ridgeline webpages:
"The integrated closed-box frame with unit-body construction is quieter than the conventional body-on-frame design. Not only does this greatly minimize the buzz, squeak and rattle generally associated with body-on-frame trucks, but it also greatly enhances the Ridgeline's ride and handling, especially when fully loaded. The two integrated, fully boxed and reinforced frame rails and seven fully boxed cross members give it added strength and class-leading torsional rigidity.
Basically, the frame keeps the unibody from twisting under load.
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