but when you spawn the police car it has literally no tires
You need to fix it in the server.cs file. Open it in any text editor and find these lines:
defaultTire = PoliceCarTire;
defaultSpring = PoliceCarSpring;
And change it to this:
defaultTire = PoliceCarV2Tire;
defaultSpring = PoliceCarV2Spring;
It was an oversight from the guy who tried to update it