Mission 54 Destroy Cavar's Construction Vehicles
Like the moonshine trucks, box them off, and take them out. Damage to the gas tank will blow them up, but a spray of machine gun fire may be needed to get their attention first (you can also shoot out their tires, but almost any gunfire will cause them to pull over and engage).
As before, there's no end to these trucks, so consider them roving targets of opportunity.