I am currently only aware of 3 vehicles with bulletproof windows:
- The police transporter van - the one that lays stingers on the road (however the side windows are not bulletproof and only have bulletproof coating)
- The police (SWAT?) van - that appears at higher wanted levels and also has bulletproof windows (all of them are bulletproof)
- A third vehicle which was gifted to "returning" people, who I am not.
The issue with the above police vehicles is they cannot be stored in 6-car garages, and they can only just fit into a characters safehouse garage. In addition, they are slow, clumsy and don't even have bulletproof tires.
So, in singleplayer, are there any vehicles (that I can buy, steal or upgrade) that come with bulletproof windows?