damian123456798

I just went through this and you can do it, pretty easy if the cars are already installed. Go LSPDFR>data>agency.xml and edit it. You can copy and paste the name of the vehicle(s) you want ai to patrol/respond for backup in for each agency.
 
Here's how mine looks for example for LSPD:
 
<Name>Patrol Unit</Name>
            <Vehicles>
                <Vehicle>police</Vehicle>
                <Vehicle>police2</Vehicle>
                <Vehicle>police3</Vehicle>
                <Vehicle>police4</Vehicle>
                <Vehicle>police5</Vehicle>
                <Vehicle>police6</Vehicle>
                <Vehicle>police7</Vehicle>

Yo bro I honestly don't thank people enough on here. I constantly am finding help and then just bouncing but wanted to say I appreciate you posting this and taking the time to write it out. Super helpful and a game changer. Cheers !!!