IFVs and Fast Attack Craft are insane right now. I have both fully unlocked, they just destroy anything in their path. The TOW on the IFV is a must, it's a two shot kill on a tank and the next round is in the chamber almost before the first one has hit.
Don't even get me started on the boat. With two good gunners and an engineer doing repairs, you become an unstoppable god of watery death.