Some advice regarding multiple unit numbers. Most people tend to just slap a different number and call it a day. Having 5 identical Taurus cruisers with the same exact equipment gets really boring and makes each unit feel like a clone of the other. Sometimes though, vehicles in a fleet have mild differences between them despite being 'identical'. Example here:
This one has two bumper mounted speakers.
On the opposite end, this one has speakers inside the bumper. It also has an unkown object on the left grill. The airhorn is also positioned more to the right.
For the purposes of Em4, try making one instance of each vehicle. On a police side, a decent sampling could be like this:
Taurus cruiser
Taurus cruiser w rambar
Taurus cruiser supervisor
11 CVPI with LED bar
06 CVPI with older lightbar
Adding tiny differences with each vehicle adds a nice touch that gives each vehicle its own unique 'identity'. It also helps with realism.