Making moving vehicles.

Demo map with moving truck download.
Also has the reveal trigger added.

Create waypoints on the path you want the vehicle to patrol/move.
If under an 8 player map, create waypoint with special ID. Waypoints 0-7 indicate player start position. I've started with waypoint 10 in the demo map.

Place vehicle on map near the first waypoint.

Now create a Taskforce and name it truck (or car, patrol1, etc)

Add a unit
Number of Units: 1
Unit type: Truck A

Now create a script named truck

Add an action
Type of action: Move to waypoint
Waypoint: (the waypoint where the truck will be unloading)

Add an action
Type of action: Guard Area
Time units to guard: 10

Add an action
Type of action: Move to waypoint
Waypoint: (the waypoint the truck came from off the map)

Add an action
Type of action: Guard Area
Time units to guard: 15

Now create a new team and name it truck.

Veteran Level: 1
House: (the house the truck belongs to)
Priority: 5
Max: 5
TechLevel: 0
Group: -1
Waypoint: (the waypoint the truck is on top of off the map)
Script: truck
Task force: truck
Tag: None
Now make sure that none of the boxes at the bottom of that window are checked!

Now create a new trigger and name it truck

House: (house that truck belongs to)
Type: 2 - Repeating

Event 1: 13 Elapsed Time...
Number: (number of seconds before you want the trigger to begin)

Action 1: 4 Create Team...
Teamtype: Truck

Now double click on the vehicle and attach the tag to it.