NorthWeapon's tip is excellent too, think I've been driving some Axis players mental with my mortar pit... I don't necessarily win the game but frankly if you lose to me you might as well consider spoon wittling as a hobby instead.

Even found a use for the AEC ( take my nubbinseness into account here ) using it merely as a scout car for the mortar pit. 50 sight range is rather nice to have so rather than taking any infantry on I just sit it there out of their sight range and have the hyperactive mortar pit rain death on them. Pumas and Kubels can see them but it seems to just about handle the former. It even has a laser range finder in case Shrecks rush it, if the coaxial is firing you are too close.

Mortar pit seems to fire twice as fast with command car plus garrison, and the inevitable UC is pretty useful for defending it along with the AECs when the obligatory shreck blob turns up to destroy it.
It seems to let me build my forces up in the mid game where previously I was being waxed off the map in no time.
Stick a Firefly being them and they spot very nicely for it too.