Exceptions are any captured enemy mobile suits, the Project V units (Gundam, Guntank, and Guncannon), as well as all of Char Aznable's mobile suits (Zaku II, Z'Gok, Gelgoog, and Zeong).
The real life Type 87 self-propelled anti-aircraft gun of the Japan Self-Defense Forces was unofficially nicknamed as Guntank after the fictional weapon by troopers.
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RMV-1 Guntank II first appear as part of Mobile Suit Variations and design by Kunio Okawara.