When the sun was out and I was driving in the opposite direction, I would get fried because the rear window of my 1968 Chevrolet C10 truck is literally right on my back. So I got it tinted with 5% at Top Notch Tint out of Freeland, MI. Cost me $80 (original quote was $110) and took him an hour while I used their WiFi to got some work done. Check out the before and after pictures.
Now I need to get that air conditioning kit installed.