Dispatch.meta functions and doubts

So, i've had download some modded dispatch.meta. and looking them i want to ask some questions because i want to make my own dispatch file. The one i liked it's the Sixth Star from Olanov. Here some questions:

First, this area:

If i understood well, the police, or ambulance or Firemen have 10 seconds on the lowest time, and 20 seconds it's the max time to appear. 

Here, lets me ask something: For example, if i put on vehicle models like this:

<Vehicle>police</Vehicle>
<Vehicle>police</Vehicle>
<Vehicle>police</Vehicle>
<Vehicle>police2</Vehicle>

Could the chances of police spawn will be higher than police2?

What this part do actually?

On DT_ArmyVehicle, it's standard the number peds to spawn by 6, but the Crusader when chasing the player is with only two soldiers, differently of FIB Buffalo, with 4 FIB Agents. How to change that(Can we do that actually)? At general, it's possible to change how many peds will spawn in a individual vehicle? Or Roadblocks?