@Ethical
Yeah, I think that looks right. Just test it out & see what you get

Note:
Be sure to create a backup of your 'mods' folder 'update.rpf' before you install 'vehiclemodelsets.meta'. I've seen syntax errors in it damage 'update.rpf' & make it only recoverable from a backup. With a full '.rpf' backup created you'll be 100% safe to experiment etc
It's a good policy to get into , poorly crafted '.oiv' installers can do the same thing to 'update.rpf'.

@Ethical
This should give you the basics

@SentinelMad
No probs bud, shame it didn't work.
One thing that might be worth trying is downloading all the different dispatch mods you can get your hands on & see if any of them implemented a script to handle more than three VEHICLE_RESPONSE's.
If so, you could probably use their VEHICLE_RESPONSE naming structure & personalise their other assets/functionality to your liking.
If gta5-mods search is ever being funky, try this (change "dispatch" to whatever search term you want)

@SentinelMad said in How to create new dispatch types?:

define the default response as something else

I don't think there is any way to do that just using the game files. A script may be able to do it perhaps.

@SentinelMad
I investigated & can confirm I get the same outcome . Any custom defined 'VEHICLE_RESPONSE_' placed higher up than the 'VEHICLE_RESPONSE_DEFAULT' (in the '<ConditionalVehicleSets>' sections in 'dispatch.meta') replaces all other vehicle responses everywhere, not just in the zones edited.

Example:

		<Vehicle>
			<Name>POLICE_CAR</Name>
			<ConditionalVehicleSets>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_ARMY_BASE</ZoneType>
					<VehicleModels>
						<Vehicle>crusader</Vehicle>
						<Vehicle>mesa3</Vehicle>
						<Vehicle>barracks</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_M_Marine_01</Ped>
						<Ped>S_M_Y_Marine_01</Ped> 						
						<Ped>S_M_Y_Marine_03</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_COUNTRYSIDE</ZoneType>
					<VehicleModels>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF2</Vehicle>						
					</VehicleModels>
					<PedModels>
						<Ped>S_M_Y_Sheriff_01</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_STRAWBERRY</ZoneType> <!-- Custom ZoneType placed here. Replaces all vehicle responses everywhere-->
					<VehicleModels>
						<Vehicle>crusader</Vehicle>
						<Vehicle>mesa3</Vehicle>
						<Vehicle>barracks</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_M_Marine_01</Ped>
						<Ped>S_M_Y_Marine_01</Ped> 						
						<Ped>S_M_Y_Marine_03</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<VehicleModels>
						<Vehicle>police3</Vehicle>
						<Vehicle>police2</Vehicle>
						<Vehicle>police</Vehicle>
						<Vehicle>policet</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_Y_Cop_01</Ped> 				
					</PedModels>
				</Item>
			</ConditionalVehicleSets>
		</Vehicle>

If you place your custom vehicle response lower than 'VEHICLE_RESPONSE_DEFAULT' then it is not used by the game at all (ie looks like a max of 3 can be used etc).

Example:

		<Vehicle>
			<Name>POLICE_CAR</Name>
			<ConditionalVehicleSets>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_ARMY_BASE</ZoneType>
					<VehicleModels>
						<Vehicle>crusader</Vehicle>
						<Vehicle>mesa3</Vehicle>
						<Vehicle>barracks</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_M_Marine_01</Ped>
						<Ped>S_M_Y_Marine_01</Ped> 						
						<Ped>S_M_Y_Marine_03</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_COUNTRYSIDE</ZoneType>
					<VehicleModels>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF</Vehicle>
						<Vehicle>SHERIFF2</Vehicle>						
					</VehicleModels>
					<PedModels>
						<Ped>S_M_Y_Sheriff_01</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<VehicleModels>
						<Vehicle>police3</Vehicle>
						<Vehicle>police2</Vehicle>
						<Vehicle>police</Vehicle>
						<Vehicle>policet</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_Y_Cop_01</Ped> 				
					</PedModels>
				</Item>
				<Item>
					<ZoneType>VEHICLE_RESPONSE_STRAWBERRY</ZoneType> <!-- Custom ZoneType placed here. Unused by game -->
					<VehicleModels>
						<Vehicle>crusader</Vehicle>
						<Vehicle>mesa3</Vehicle>
						<Vehicle>barracks</Vehicle>
					</VehicleModels>
					<PedModels>
						<Ped>S_M_M_Marine_01</Ped>
						<Ped>S_M_Y_Marine_01</Ped> 						
						<Ped>S_M_Y_Marine_03</Ped> 				
					</PedModels>
				</Item>
			</ConditionalVehicleSets>
		</Vehicle>

So at the moment at least, it looks like the game will only accept a maximum of 3 different ZoneType/VEHICLE_RESPONSES & perhaps they also have to have the correct vanilla names (it's not like a custom named one replaces the DEFAULT one like for like, looks more like it breaks the game & just spawns everywhere. That suggests the game don't like custom naming or something about editing it this way etc).

I'll investigate further, but probably don't hold your breath, it's not looking too good.

@SentinelMad

The GTA V Interactive Map posted in that link no longer works, site went down a few months ago. I haven't found an alternative.
Ideally, what you need is a Interactive Los Santos map that allows you to enter & find coordinates, but a simple map with the coordinates on it (hit the button & use +/- to zoom in & out) will work too, just a little more work.

@SentinelMad said in How to create new dispatch types?:

are they part of other coordinates in the popzone.ipl?

Yeah, they will be other entries in 'zonebind.ymt', you'll just have to investigate likely ones (start with anything with freeway, highway, motorway etc in the name etc) & check their coordinates from 'popzone.ipl' against a map until you find the correct ones.

Once you get an idea of how GTA coordinates work (0,0 central point, left = negative x, right = positive x, down = negative y, up = positive y etc) you might then be able to find the coordinates over the freeway, & then look in 'popzone.ipl' for ones that are in that rough area, & hopefully work back to identifying the correct ones in 'zonebind.ymt' (admittedly, not ideal working that way, lots of coordinates in 'popzone.ipl' to manually check etc).

P.S
If you find a truly interactive Los Santos coordinate map, give me a shout , that thing was essential for me

@SentinelMad
You probably want to have a read of this, specific instructions will differ, but it covers the basics of what you want to do I think.

@Emerald-Mustang
Yep, sounds like a ModKitID conflict. Refer to post#2 or search internet for info

@Emerald-Mustang
If you edit the equivalent lines in it's 'carcols.meta' data to this:

  <Kits>
	<Item>
      <kitName>0_default_modkit</kitName>
      <id value="0"/>

& the wheels start working, then you have a ModKitID conflict.

How to Fix a ModKitID conflict:
To fix, you'll have to find a free '<id value=' value (or live without the upgrades). There's no set rules on how to find one that works, just revert the changes outlined above & try numbers at random until you find one that works.
Counter to what a lot of threads about ModKitID conflicts say, the '<id value=' above is the only value you need to edit, it doesn't need to match the number in the '<kitName>' line.

@gamersrights69
I don't use Menyoo myself, so can't comment on it's functionality, but the version of it on here is almost 2 years out of date & even the newer version on GitHub is a year out of date (if you downloaded from here, try the GitHub version instead).

Perhaps try a different & newer trainer to spawn vehicles, something like Simple Trainer should fix the vehicles despawning after a few seconds at least (just installing Simple Trainer should fix the despawning, even if you continue to use Menyoo to spawn vehicles ). Might even fix add-on vehicles not spawning too.
If no add-ons are working, have a look at this thread & make sure 'dlclist.xml' is functioning correctly & doesn't have any syntax errors in it.