If you think you've seen this exact thread on LSPDFR.com then you're right. I really need an answer, though, and all the vehicle mods on here are really high quality so someone has to have an answer. Unless I'm really stupid, the flag HAS_BULLET_RESISTANT_GLASS does not work unless the vehicle itself has been modeled with bullet resistant glass (yes? no?) I think. I recently created an unmarked Alamo and want to give it bullet-resistant glass, but I'm not sure how to do that, outside of literally merging the glass from like an armored Baller or something onto it and tediously deleting polys so it fits.
I would highly appreciate any response even if it's "I don't know". Please, help me.