Mounting brackets above rear tires

Hello Tundra Brothers!
Does anyone know the brackets above the rear tires are for?
Are they for a skirt or apron?
The Sequoia has road nose shielding there.
Is it because the frame is the same as the Sequoia?
Just curious if I can lower the road nose.
Thanks Brothers.

 

Not sure what the brackets are for, but if you want a quieter cabin you can add sound deadening materials to your doors and floor. Tires will have an impact as well. I noticed the stock Bridgestone tires are very quiet compared to most all terrain tires. Also, adding a road noise shield in the bed area won’t do much good since it’s separate from the cab.