In fact there is no clear anti-heavy-veh unit for the claoky factory. Rocko could be one of those, but dies way too easily to levelers, and can not hit shit.
* scorcherers can rape a pack of rockos without even getting hit
* missile trucks outrange them enough to kite
* ravagers, reapers and gollies have way too much HP to care
* Banisher outranges and rapes them, just as leveler does.
So, in the end, the only real anti-heavy combo that cloakies have is tick + alot of glavies. There is just no unit to deal damage without being massively expensive or having to get super-close. For example, reculses have no problem killing veh due to extra mobvility and massive range (outrange banisher).
Suggestions:
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Make rocko missiles tracking (but still slow so raiders can outrun them)
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Give them 1.5x more damage
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Increase reload time
That will make rocko a very useful semi-suicide unit (especially in combo with cloak - shoot - cloak tactic), and also a decent ambusher. For that part they could use cloak-when-static policy just like fleas, so they can actually ambush heavy units and rape them from behind without the need for sneaky pete.