A replacement for 1 car.

[Reebs]

Replace the Police Car with this
[Image: 2013_GMFleet_chevrolet_tahoe_2wd_360_960x540_01.jpg]
A nice police Chevy Tahoe. It could have the same handling and seat count as the Hummer.

Don't replace the police car if you are gonna replace something with that, replace the SRU vehicle, the (IRL) police cars aren't a mass of countryside Trucks, I personally would think it would be unrealistic if the general police car was like that, just use it as SRU or get a swat truck or something.
PS: I agree the hummer is a great vehicle due to it's seating and handling, That should be what the values for the SRU truck should be.
PS: The new car should also have a police version. I mean like a truck for SRU or a Dodge for a Police

+Support for the dodge if it's a charger