Adding a vehicle pack is supposed to be a five-minute job. It usually isn't, because most packs ship with subtle issues that don't show up until a player drives them.
The folder structure that works
resources/[vehicles]/your-pack/ containing a stream folder with the YFT/YTD files, a data folder with the meta files, and an fxmanifest.lua declaring the data files. Don't dump everything into stream — keep meta files in data and reference them properly with data_file 'HANDLING_FILE' 'data/handling.meta' and friends.
Handling.meta gotchas
This is where 90% of the-car-drives-weird issues live. Don't paste handling values from random forum posts; either keep stock GTA handling or dial it in carefully. Bad mass values especially make collisions feel wrong.
Modkit collisions
Each vehicle has a unique modkit ID that controls available tuning parts. If two vehicles in your stack share an ID, you will get visual glitches when modifying either. Cross-check your carvariations.meta IDs against your existing vehicle catalog before adding a new pack.
Sirens and ELS
If you are streaming emergency vehicles, decide whether you are using vanilla siren stages or ELS (or its more modern alternatives). Mixing the two breaks both. Pick one approach and stick with it across your entire emergency fleet.
Test on a clean dev server
Always. New vehicles should boot on an isolated test server before they touch production. The number of the-texture-is-purple-in-game tickets that come from skipping this step is staggering.
Wrapping up
Vehicle additions are mostly a discipline problem. Keep the structure clean, audit your modkit IDs, and test before you ship. A neatly organized vehicle catalog is a quiet sign of a well-run server.
Written by
Sarah Chen
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