I only put in the LCPD crown vic and tahoe. I don't have mods where I can spawn cars or anything. I put that in through SparkIV.
I've never done modding of any sort before so I need some guidance with this.
Trying to recall exactly what I did, I downloaded IV from Steam, applied the update to IV, downloaded LCPDFR (0.95), went through the process to put cars in there as shown by the tutorial.
I have a laptop, Intel Pentium B950 2.10GHz, 4.0GB RAM.