At highway speeds of 70mph, most of the noise is from the mirrors. They are large and not aerodynamic. Pull the mirrors in at speed and see how much the noise diminishes.
I am planning a road trip from NJ to Nashville and then to Austin to see Kill Tony at the Comedy Mothership in October. That's a pretty straightforward drive.
From Austin, I am planning to head out west to see some sites. I'd like to make it to Yellowstone. So far, I was thinking (from Austin)...
I am currently doing the same - creating a mount for my 12.9" IPAD Pro including Otter Box Case. I am using a Tackform headrest mount. I will connect to a 20MM ram ball mounted on the facotry dash mounting point. I ordered an extra 12" extension arm from Tackform to get far enough past the dash...