The Gameconfig file available on GTA5-Mods.com is essential for stabilizing GTA V when installing large numbers of "Add-On" custom vehicles, preventing crashes caused by memory pool overflow. This configuration, paired with HeapAdjuster and Packfile Limit Adjuster, allows for over 300 cars by modifying the game's default gameconfig.xml via OpenIV. You can find the file and instructions at GTA5-Mods.com.
You cannot just drop a 300-car gameconfig into a vanilla game. It will crash. You need a trilogy of memory mods. Think of these as the foundation, the walls, and the roof. https wwwgta5modscom misc gta5gameconfig300cars top