Same problem here. I added the dlc.rpf with the vehicle to my dlcpacks folder. When starting the server you can also see that the total file size has increased considerably. But I cannot spawn the vehicle under its name. Is there anything else I have to consider?
Maybe its obvious to all of you, but I just spend 3 hours figuring out how to add custom cars and it's still not working. Can someone explain this from step after I download the car from gtamods website. Thanks