The S.T.V is a gigantic purple delivery van with a heavy machine gun mounted on top. It is unlocked by collecting the parts and blueprint for it in Lava Falls. It is factionless.
The S.T.V is based on a 1980s chevy step van, with the usual post apocalyptic modifications in this game.
As a large vehicle, it is slow, but has a lot of health. It can be usefull in missions that require a lot of combat. But, like most large vehicles, it is a poor choice in races and side activities with time constraints.