It should be within or nearby the camp you traveled to all repaired and ready to go.
Tired of losing your walker after you spent hours finding it? To repair it, and any other vehicle, just use Guerrilla Express while inside your vehicle. Use Guerrilla Express to travel to the oasis base and the tanks will be there repeat for infinite salvage. Go to the oasis safehouse and turn around there are 2 non-EDF large explosive tanks, Shoot them from a safe distance pick up the salvage. The requirements for each Achievement are listed below as well.
