Tint - what percent in front... how much?

[Slingshot]

I have 20% on the two fronts and 5% on the rest of the windows in my H2 in PA. The shop said 30% is legal, but a cash deal of $150 and the shop did the whole truck.
A State Trooper buddy told me if you do get pulled over the best thing to do is put all the windows down and turn on the dome light and put your hands on top of the wheel. He said it relieves the stress level of walking up to a tinted car or truck if he can see the inside of it.