jplante4 wrote:
... The problem with polarized is that it may filter out the screen on the GPS or tablet.
jplante4, you are correct.
I have a  7" rear camera screen and an RVI TPMS screen that is an Android.   The Android is designed with an anti-glare axis that works with polarized sun glasses when it is horizontal as RVI has you install it.  The Rear camera screen however, unfortunately used a universal screen designed for vertical placement but the product must be installed horizontally.  I am working with the manufacturer to correct this.  All a manufacturer has to do is pick the correct anti-glare axis to use.   You can see in the two photos below how it looks with my glasses turned different ways:
Polarized glasses as you wear them, Rear view bad, RVI good.

Polarized glasses turned sideways, Rear view good but RVI  Android starts to look bad.
