The vehicle is not parked and travels between two points (M3,2) in the northern part of the map. As soon as you locate it on your radar (it remains visible at all times) and you notice that it is moving towards you, you can prepare an ambush. A perfect spot is the road in front of the north-eastern base (M3,5). This time, the trick with shooting the man inside may not work - inside, there are two people (the driver and the shooter).
A good idea is to use Teller Mine, which will stop the car (although, it may not). Plant it so that you will not get within its blast, while still close to the vehicle (e.g. hide behind a boulder).
Crawl up to the car and attach explosives bag (you will receive it for the mission and it is unlimited). Click again to set the timer and run away.