HVY Insurgent and Nightshark to had dark window tinting as standard. (Part of Realistic vehicles.meta config development)
This is one of the new ideas that I would try to develop in my Realistic vehicles.meta config mod. But it also depends on if people want them. This idea is based on VVIPs. Insurgents and Nightsharks were ideal transports for VVIPs, so it would be a nice touch to add very dark window tints for them.