They can crush everything except buildings. ;-P
Their cost is $4000, but probably it'll be upped to $5000 or $7000 with 50% faster production modifier.
AAX Prime
http://www.moddb.com...ime-075-version
AAX Prime is a LU with lowest hitpoints because of its vulnerable legs and fastspeed exertion. Perfect for rapid attacks on enemy ore miners or weak defense points. Has a strong AA rocket launcher. Like other LUs, can crash anything (apart from buildings).
The Allied scientists joke that AAX stands for Anti-All (mechanical) eXoskeleton.
The model is made by MadHQ.
Gehenna Tank
http://www.moddb.com...ank-075-version
Gehenna Tank is a prototype of a new apoc. Having the same abilities as other LUs, being crewed with mindcontrolproof metalmen, is nevertheless much slower, but also can endure much more direct fire (4k hitpoints, as against Mind Destroyer's 2000 and AAX's 1750 hps).
Like AAX Prime, has a strong rocket launcher against aircraft.
This one is made by Raminator.
Mind Destroyer
http://www.moddb.com...er-075-version/
Mind Destroyer has two cannons against light-armoured infantry and vehicles, moreover, it can overtake any enemy buildings, heavy-armoured vehicles or heavy infantry. Besides, it's also able to crush anything on its path. It's driven by Yuri (Prime) himself.
The credit for making this one goes to MadHQ.
Yes, they're 3 tier buildings. Additionally, AAX Prime can be built after the Robot Control Center is up.