Fix the truck at the dental Clinic. You can do this if you decide to subvert the mission, in which case you drive the truck to a garage in Sefapane. If not, you can just blow up the tanks that the truck is carrying. Even the dental clinic has armed guards it as well! Not somewhere you would exactly like to go if you had a toothache! I'd hate to see what Tesco, Asda or Marks and Spencer would be like if they set up in that country, it would be mayhem XD!