gta v like rpg damage

i want to know how to edit the files & change the RPG damage to make the RPG very OP like GTA V's RPG Damage, i feel like this game's RPG launcher is NOT powerful enough, i remember it took me 10 or 12 RPGs to fully destroy a semi truck in this game, like HOLY F*CK that's way too OP. NO JOKE! my...