GameConfig for Add-On April 2018
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PoolName>Vehicles/PoolName>
PoolSize value="400"/>

PoolName>VehicleStreamRequest/PoolName>
PoolSize value="160"/>

PoolName>VehicleStreamRender/PoolName>
PoolSize value="200"/>

PoolName>VehicleStruct/PoolName>
PoolSize value="300"/>

PoolName>HandlingData/PoolName>
PoolSize value="1050"/>

PedsForVehicles_Base value="175"/>
PedsForVehicles value="175"/>

VehicleMemoryMultiplier value="600"/>

VehicleUpperLimit_Base value="140"/>
VehicleUpperLimit value="230"/>

VehicleParkedUpperLimit_Base value="140"/>
VehicleParkedUpperLimit value="200"/>

MaxVehicleModelInfos value="420"/>

MaxExtraVehicleModelInfos value="350"/>

PoolName>FragmentStore/PoolName>
PoolSize value="13200"/>

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These values change with every update so just add 100 to whatever the current value is in your gameconfig.xml file in your mods/update/update.rpf/common/data folder and you are golden...unsure of total amount of addon car mods is with these values but I have it working with 12 addons right now and no infinite loading screens and no crashing, cheers peeps!