You do realize that for the three AV weapons, there are numerous Anti Personnel weapons? That Grenades are a threat to everyone, especially someone in Standard level attire? That your 'slow' is a scout's fast? That if we made cost of fitting a viable whine, we'd need to make the Logi's head and shoulders above everyone in everything and like it?

Tanks need to give up something to get something, and that means a tangible inmatch asset, not prefight fitting costs. You cannot have a SINGLE player suddenly gain immense power with no losses beyond 'can't cap no more'. No other vehicle can be manned effectively with one single player, and as such are balanced against being a one man force multiplier. A LAV or Dropship both need players to ferry around the map or they aren't doing their job, and both need other players aside from the pilot to operate their weapons systems, and you don't see LAV players cry for turret control. Tanks already HAVE something, they can be piloted and gunned from the same seat. THAT is your bonus. Don't like it? Ask to trade it in for something else and stop whining for more.