You storm chasing to have rain come backwards in the cab?
I like to drive w/ an open window for air circulation.
W/ newer vehicles, the drone/wind buffering sound you get w/an open door window bothers my ears. It's not the tires, it's the way newer vehicles are designed. I also own older vehicles & they don't do that & they have the same tires.
When sitting still while its raining, the rain will slightly come in the back window. Then when you take off, it rolls of the roof & into the cab. The rear visor prevents this.
I currently have a crappy tonneau cover that prevents bed debris from flying around.
Once the cap is put on, you won't see the visor. But it will bridge the gap between the cab & cap & still prevent the rain from rolling in & still allow my air ventilation w/o the air done sound.
I have done this setup several times over the years on several diff gens of gm trucks & has always worked out for me.