I am running Vapid Stanier 2nd (Police) and Vapid Interceptor (Police2) as my main vehicles. I have taken templates and used designs used by Lexington - Fayette Urban County Government (LFUCG) in Lexington, Kentucky in order to design Liberty City - Liberty County versions for my game. Cars 1 and 2 are modeled after the Lexington Police Department with the 3rd car being modeled after Fayette County Sheriffs Department. The templates were very easy to make and just took a little time to customize but they work for me and I have been playing with them a while now and still not even starting to get tired of the design.
Credit and thanks to Luxart for the vehicles and templates used and thanks to the LFUCG Division of Police and the Fayette County Sheriffs Department for the design ideas.