Our door windows have reflectix foil / bubble insulation velcroed on to both our door Windows. Blocks light, view, and heat. I'll be changing out both door Windows with dark tinted safety glass cut by our local glass shop soon. Either way, the cheap and easy way is relectix, found at lowes.
You'll be hard pressed to tint the inside of the stock widows due to the texture, thus better off just covering them.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)