Ours is the caiman model, a 6x6 behemoth that weighs in at over 15 tons and makes Humvees shrivel up with feelings of inadequacy.
The caiman offers a range of option packages, from bristling-with-machine-guns, to monster-truck-field-hospital.
also cayman, 1570s, from Portuguese or Spanish caiman, from Carib acayouman "crocodile," or perhaps from a Congo African word applied to the reptiles in the new world by African slaves. "The name appears to be one of those like anaconda and bom, boma, which the Portuguese or Spaniards very early caught up in one part of the world, and naturalized in another." [OED]