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Car file is 772 thousand polygons... Definate fivem No.

@KiraOniiChan i edited the game config in update.rpf in the end not common, and now all my cars are working. Have 23 cars in atm and its working, in multiple dlcs

@speeder3682000
Lines, 382, 386, 390, 394, 778, 781, 1349, 1353 In the common.rpf>Data > Gameconfig.xml
This was as of Jan 9th 2018

@Speeder3682000 I managed to get it to work, just edit your original rockstar one (backup of course)
What values specifically? From what I've gathered you need to change the following:
<Item>
<PoolName>Vehicles</PoolName>
<PoolSize value="300"/>
</Item>
<MaxVehicleModelInfos value="310"/>
<MaxExtraVehicleModelInfos value="100"/>
to something like:
<Item>
<PoolName>Vehicles</PoolName>
<PoolSize value="400"/>
</Item>
<MaxVehicleModelInfos value="400"/>
<MaxExtraVehicleModelInfos value="150"/>

Thanks to @Kilyin on LSPDFR fourms for that. my Problems were the bottom two values, I have 6 cars and counting now. I Tripled All Factory Values.

Hey guys, So I have 4 addon cars, all installed in the same dlc.rpf. If i install a fifth. The game crashes.
I tried this config file, and I STILL cant get any more than 4 addons. I can replace all i want.

I also tried editing the Rockstar provided one
<Item>
<PoolName>Vehicles</PoolName>
<PoolSize value="900"/>
</Item>
<Item>
<PoolName>VehicleStreamRequest</PoolName>
<PoolSize value="180"/>
</Item>
<Item>
<PoolName>VehicleStreamRender</PoolName>
<PoolSize value="110"/>
</Item>
<Item>
<PoolName>VehicleStruct</PoolName>
<PoolSize value="159"/>
</Item>

under platform any
And

<Item>
<PoolName>Vehicles</PoolName>
<PoolSize value="828"/>
</Item>
<Item>
<PoolName>VehicleStruct</PoolName>
<PoolSize value="297"/>
</Item>

under Pc Overrides.

Any idea's guys, I'm starting to think its impossible to have more than 4 addon cars. I would like to add that The car i'm trying to add DOES work, I deleted one of the other cars and installed the "5"th in the "4"ths place game boots fine. If I add "4"th back in "5'ths place no bueno

@FastBurst
Check your <audioNameHash> line in Vehicles.meta, and make sure the modder wasn't lazy and put in this.
<audioNameHash />
If he did the game looking for sounds with the same filename as the model. When you add models you change the name so it finds no sounds. Just rewrite the line
<audioNameHash>*modelname for sound*</audioNameHash>
Replacing whats in between with the name of the sound you want it to use. For ex "contender" if you want a diesel truck
<audioNameHash>contender</audioNameHash>

This File is awesome, will tackle adding vehicle mods rpf's to it tomorrow. But Made Life So much easier.

@co11ector
You need to add This To the dlc.rpf>content.xml, and then Copy the file over from one of your mods, all other mods will have to be added to this file, like the other files,

<Item>
<filename>dlc_modding:/common/data/carcols.meta</filename>
<fileType>CARCOLS_FILE</fileType>
<overlay value="false" />
<disabled value="true" />
<persistent value="false" />
</Item>

Make sure the Carcols file IS EXACTLY where the Filename Path Puts it, or your game WILL crash when it cant find the file. The config provided puts it with the carvariations, handling, etc files.
@Beastly_Gaming
You would have to go into Both dlc.rpf>Content.xml and rename each item to the new name, as well as change the name in dlc.rpf>setup2.xml in order for it to load correctly. (This is just observation from other dlc.rpf mods)

@masterschwag I've gone through all the config files and none seem to be out of order as far as I can tell, but the car will not load through the dlc . I decided to try version 1.00 and that version works. Well i was going to update the 1.0 working file to find out which file from 1.5 has the bug, But the dlc car will no longer spawn if i edit the dlc.rpf in any way. :(

This is one of the best modded Vehicles I have driven in GTA. EVERYTHING works, and it Drives well. 10/10 Five stars isn't enough, Love Patrolling in this car. Even if I have to put up with AI Transport units. Comment now on right file ;P

@masterschwag So i totally realized i left the comment for your 2015 one, not this one, so i went what the heck and tried to install it. and this one crashes the game on load :( If i remove the <Item>dlcpacks:\policegt350r\</Item> line the game doesn't crash, but obviously the car doesn't load either. I manually installed it as a addon file, (non Replacer in Patchday9ng) using your replace configs and the car works. but if I use the dlcpack version the game crashes I'm pulling configs from the dlc version now to see which one breaks it.