Self-Propelled Guns
Self-propelled guns (SPGs), more often known as artillery, provide powerful indirect fire support with a very large range that can potentially cover the entire map. They stay safe by remaining well within friendly lines and provide support against tough stationary or slow targets. Artillery is just as good as the team. So if you (as arty) find yourself in a "bad team" or a team that only camps, you will not get the full potential to the powerful gun you have and support as much that you wanted to.