J.F.
The Eddie Bauer window cling "tint" has worked well for us and the hubby drives a 2500 Silverado. You can find it at Target and cut it to size/weird shaped window corners if needed. Otherwise, have you considered sunglasses? My daughter loves to wear hers like Mommy & Daddy--my preferred brand is Julbo (available at Amazon and Gatortots)
Have fun on your trip!