This quest is not available in game.
Continue your search for signs of Dugar in the Arakkoa settlement north of the broken cart.
The arakkoa tracks, accompanied by a pair of shallow ruts, lead north across the road. It seems the arakkoa dragged something away from the site of the battle, perhaps toward a nearby settlement.
While the broken cart shows signs of a struggle, there's little information about Dugar's fate. Follow the arakkoa tracks north and continue your search for the merchant. If he was captured alive, there may still be a chance to rescue him.