The Truck is a 
Jakobs Shotgun.
Truck Fixer-Upper gives huge damage and critical hit damage
Can be found in the Elements: Kinetic
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How to Unlock the Legendary Truck Shotgun
Weapons
Legendary Loot
Rich Text V2
How To Get
Unlock Location:
- Progress through the story until reaching Dominion Region.
- You will find a Side Quest called "One Slimey Issue" in the Fades District.
- Complete the Quest and at the end you will find Bio-Thresher Omega.
Farm Method:
- Defeat Bio-Thresher Omega.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Bio-Thresher Omega until Truck drops.
Loveless
Amon
Crucible
Malignant Construct
Vex
Dead Ringer