Hi, as we are facing Server #119 from now, when targetting Intercity Trucks (big rigs) target only their trucks. Hitting trucks belonging to enemy server helps us to get points for the server vs server event and can get us invasion rights for next week. It means you can get a chance to loot the enemy and that most of us won't be looted.
As some people who make mistakes tend to say they don't yet know how to do so and that the game is often confusing here is some basic guide:
You should use the truck icon on the left part of the screen to open the Intercity Trucks interface, both to initiate looting and to send your own trucks for reward. Don't attack big trucks on the map.
On the top right corner of the "Other's Trucks" page there is a small dice icon, so you can refresh the available trucks, and there are no limits on it. On the top left area there is the "Hide trucks of this State" checkbox which should be checked.
When you tap a truck and a window comes up, you will see plenty of the information, including information about the owner. It should have #119, followed by an alliance tag, and then a name.