I was on a vehicle TDM the other day, and someone was bombarding our base from afar with a tank, albeit not very successfully. We had to go out and destroy the vulnerable tank, but ti was guarded by some very skilled snipers.
This gave me an idea. We need some sort of tank-like mobile artillery for just that purpose. Something like a mortar, which you can use to bombard the enemy base from afar with. It would be vulnerable at close range, so it would have to stay out of the action and be defended by teammates. A system that requires outriggers to be deployed slowly to fire would also prevent it from shooting and moving, which would give it too much of an advantage.
What do you think?