Finally got the DVD of this (under the title War of the Monsters). The quality isn't that good but it's still better than what I submitted previously.
Jeep used by the Japanese doctor in New Guinea. Already listed, but better pic. 2 stars.
Jeep (different model than one listed above) used by the heroes in one scene. Mitsubishi J3R? 2 stars.
Odd little car used by the villain, Onodera, in one brief scene. It has a vaguely Volkswagen Beetle shape, but is apparently a sedan with front suicide doors. 2 stars.
There's also a very large amphibious troop carrier type vehicle used by the military in their attempt to lure Barugon into a lake and drown him, but sink me, we never get anything even resembling a decent full-body shot of it.