A Shot in The Dark | Wasteland missions Mad Max Guide

The mission is unlocked after completing the Immortal Enemy story mission. Hope that gives you this mission can be found in Deep Friah's Temple.

A hatch that leads to the chest.

Go to the marked place located on the Dunes. Open the hatch and walk inside. Go towards the pointed place. Don't worry, nothing can kill you. After leaving the train, examine one of the stocks on the right side. Take the suspension upgrade and the mission will end, at the same time unlocking an upgrade in the Garage.