Jeffb only front tinted
I would never put a tint over the already tinted back windows. I used the 35% solarguard tint that has a slight mirror look to match the back windows. Go for the tint that is a little more expensive like the solarguard or after a few years it will fade and look purple like I'm sure you have seen on the road on cheaper or less expensive cars. The solarguard never fades and stay looking mirror black for years forward. It also reduces the rays of light that fade the seats and burn the dashboards. If the interior is black you could use 35% to match, if you have a lighter interior you may want to consider the 20%. It's odd the american SUV's match at 20%, and the foreign BMW, Mercedes, and Acura match at 35%. I think it balances out the SUV and looks great!