I think the part name you're looking for is "skid plate". The Off-road version has a small "door" built into the skid plate so you don't have to remove the entire skid plate to change your oil.
The "skid plate" under the gas tank can also accumulate small rocks.
Does it squeak if you drive in reverse?
«Granite '07 LE Crew Cab, 4x4, Big Tow, Off-Road, Side Curtain Airbags, Sunroof»
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