The most efficient way to farm VT in a solo match is to use the Scout class with Double Time Perk and increased interaction speed. Select Derailed map, and hit the three locations Drug Road, Railyard and Stargazer Camp (helicopter pad at Stargazer has spawns there, you can also jump onto the nearby roof where VT also spawns). Ignore the mission, just speedrun the areas looking for VT. The more you do this, the more locations you’ll learn so no matter where it randomly outs them you’ll hit them all and get every last drop of VT. Rinse and repeat. It doesn’t have to be Derailed, as Overgrowth is also proven to be rich with VT. Those two are the best, and it’s down to your preference.
For newer players looking to level up weapons, same set up but complete the missions. Use the specific weapons that need leveling up, before you know it they’re all maxxed👍🏼
It’s a bit of a rushed explanation but it’s 6.30am here and I’ve been gaming all night so heading to bed, just wanted to share how I grind 1000-2500 VT solo every 10mins.
Hope it helps👍🏼