Update 1.1 is released, the lightbar glass and the grill light emissives weren't mapped properly, this would have only been noticed when using red and blue light textures.
I've made a small pack with changed emissive and glass colors for the lightbar. Included are all red, all blue and red/blue lights and glass textures as well as a clear glass texture. If you release any skins for the Ram, feel free to include those textures.