The Corpse Tank is hard to kill, I found it would consistently spawn on Ashen Mesa to the right / in front of the City Ruins spawn. You need the right enemies (Euruskan v Europan) to spawn as well, and they will eventually destroy it for you. When there is a tank v. tank skirmish going on, I find that is the most likely to get a corpse tank destroyed by enemies. Also a Corpse tank v. mechs is a good scenario, though the tank will probably get stomped far away which is its own mini game anyway...
...Sadly this one didn't drop a control panel for the quest.
The keybind "z" let's you mark an enemy and see its name. The Corpse tank comes up as "Europan Merkava Body Tank".
Happy hunting
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