Technology & Combat Characteristics
The RTX-65 was designed with technology closer to tank rather than that of Mobile Weapon. It is simply a bigger tank with vague humanoid torso for psychological effect, as the machine are used mostly for local control in space colony.
The Guntank was the first Mobile Suit utilized by the Earth Federation. It was technically also the Autonomous Republic of Munzo's first mobile suit before it became the Autonomous Republic of Zeon. In UC. 0068, one unit was used by Crowley and two rogue soldiers to transport Casval and Artesia to safety. When military officers led by Zabi siblings tried to stop them, Casval furiously takes over the Guntank and proceed to eliminate almost every opposing forces until Artesia helps him regain his senses. Said Guntank was evacuated as a decoy to before its passengers escaped.
In U.C. 0071, the Guntank was used to test Zeon's first Mobile Suit, MW-01 Mobile Worker Model 01 Late Type which resulted with the latter's victory. Following Zeon's Mobile Suit developments, the Guntanks were made obsolete.