if crashing install these 

Make sure to install the correct version corresponding with your game version

Gameconfig:
https://www.gta5-mods.com/misc/gta-5-gameconfig-300-cars

HeapAdjuster:
https://www.gta5-mods.com/tools/heapadjuster

Packfile Limit Adjuster:
https://www.gta5-mods.com/tools/packfile-limit-adjuster

fwBoxStreamerVariable and decals limit patch:
https://www.gta5-mods.com/tools/ymap-load-list-extent-limit-fix-fwboxstreamervariable-patch

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if car spawns and crashing when trying to enter than change vehicle layout from "right hand drive" to "left hand drive" :)