Tempest/Pre 1.3

Overview
The Tempest is a heavy vehicle which is available after Level 31. Also it is a stronger, vehicle version of the Heavy Gunner. Its unit type (Tank) and damage type (Projectile) means it is most effective against infantry groups, but is less effective against armored targets such as another tank. The repair costs of a Tempest versus the healing costs of a Heavy Gunner not very perferable in this case though it is a more effective unit.

That's not to say a couple Tempests would be very useful in handling the errant Raider attacks, as they could definitely shine doing so. Use caution when introducing them to Player-versus-Player matches, as they are less likely to be useful against hardened targets like Riot Troopers or tanks in the front row.