Toy Soldiers

Uber Tank doesn't feel so uber when faced. This level has some smaller tanks coming earlier, so you have good defences for them up already. Just make sure you have latest upgrades to your howitzers, and perhaps in mortars.

I would suggest keeping mortars at two front slots and infantry defence held back. As you have drivable tank yourself too, you should position it in entry, next to your mortars.

Uber Tank enters battlefield from far corner, and travels quite straight towards your defence line. It will drive over your left side turrent slots, meaning you lose one mortar. Just keep some distance so it wont drive over your tank. When it has driven over those, it turns back towards far end of map. Then it drops half a dozen tanks from inside. Take care of those with your tank, and continue shooting uber tank. It continues circle and drives over your right side turret slots, and drops there tanks too.
By this time you should have it killed, or almost dead at least if you have upgraded your howitzers to max and been shooting it with own tank. Doesn't cause much sweat, as Uber Tank doesn't seem to be shooting at you, only trying to drive over you.

While I thought this one was a little difficult at first, it really isn't too bad, as long as you pay attention to what you're doing.

For the large emplacements, these should all be howitzers, though it I delayed upgrading them to level 2 until the tanks start rolling in...even then, the first wave of tanks is easily taken out by using one of the tanks on the map.

The small emplacements though, I found avoiding mortars and using all anti-infantry turrets, and upgrading them to level three, in all available spots.

At least, in the times I've played the level, the most important part of beating the Uber Tank is firing constantly at it as often as possible with one of the tanks on the map...stopping to mop up the small tanks it drops, and possibly not even then if the turrets still on the map are taking care of them. An easy place to stay out of the way of the tank while it makes its runs is just behind the edge of one of the outside of the large emplacements, and driving the tank up slight, to be able to raise the tank to shoot the Uber Tank while its near the back of the map.