It has a power unit that runs on one AA battery, the same type as the Red Horn, and travels on wheels. The linked gimmicks include the extension and contraction of the exoskeleton and the up-and-down movement of the antennae, which are driven by the cam on the front wheels, as well as the rotation of the antenna via the output shaft on the top of the power unit. In the new series, only a version with a different color scheme, the Moonbay specification, has been released. Because the kit runs on wheels, it has a very strong pulling force. The trailer section is a combination of two sets of endless tracks (which have wheels on the underside for movement) and a coupler, with the panel base being a repurposed part from the Diorama Base Set. It can even transport an Ultrasaurus if placed on it. The only manual gimmick is the opening and closing of the head canopy.

Released in April 1986. The color scheme is gray for the armor, dark gray for the panel base, dark green for the other parts, and clear orange for the canopy. Early advertisements and catalogs showed the panel parts in the same color as the Diorama Set.

Released in January 2000. While the old series kit only came with the trailer, the new series added various maintenance arms that were previously included as parts for the DZ-02 Diorama Base (Factory Base). Additionally, to match the anime, it also included figures of various anime characters such as Van, Fiona, and Zeke, in addition to the pilot Moonbay. The color scheme is red for the armor, orange for the panel base, silver for the maintenance parts, light green for the other parts, and clear orange for the canopy.

In the Battle Story, it is mostly treated as a workhorse that transports Zoids. Since it is not a combat Zoid, it has few opportunities to shine, but it still performs important tasks such as transporting supplies and ammunition in addition to Zoids. When the Zenebas Empire was destroyed, there is a scene where an Imperial Gustav transports the Zenebas-only Death Saurer [78].

The Gustav itself, like in the Battle Story version, is widely used by the Republic, Empire, and civilians. Most of the Gustavs that appear in the series, excluding the Moonbay specification unit, are predominantly white-armored.

Many Zoid Warriors use it for Zoid transport.

A unit used by the heroine Sweet appears.

Units used by both the Extermination Force and the Digald Army appear. Yakuu from the Sky People and the Zoid repairman Jingo use it, with the former providing various weapons to the Extermination Force and the latter transporting La-Can's Sword Wolf to the final battleground.

It appears not as a playable character for battle, but as a support character (treated as an item in the former). It can be combined with other items to cross seas and other obstacles.

Appears as a medium-sized Zoid. There are a total of 4 types, including the standard one. ZOIDS: Imperial vs. Republic & ZOIDS 2: Helic Republic vs. Guylos Empire Appears as a unit that can be acquired by both the Republic and Empire.

The Gustav appears as the transport Zoid that the protagonist party uses to move around the field. In SAGA, SAGA II, and SAGA DS, the protagonist party uses a red Gustav, while in SAGA FUZORS, they use a gray (standard color) Gustav. Other factions may use different color variations.

The red Gustav for Moonbay's exclusive use appears. There are no variation units, but it is possible to freely equip weapons in the slots. The regular Gustav is not implemented.

The Gustav MV and Gustav EM appear. The regular Gustav is not implemented.

It appears with an arranged design from the ZOIDS concept art [79]. In the description, it is introduced as a “transportation machine” as in the original, but it can be used in missions just like other Zoids.

The machine of the freelance transporter Moonbay. Its internal circuitry has been modified with bypasses, giving it a higher recovery ability than standard units [72]. Some media state that its self-repair capability is several times that of a standard unit [81]. In the anime Zoids: Chaotic Century, it has further unique modifications, such as a two-seater cockpit and retractable firearms in the armor. There was also a scene where it destroyed a Rev Raptor with a body slam.

The unit's name varies depending on the source. It is sometimes referred to as “Gustav Moonbay Specification” [82], “Gustav MS” [80], or “Gustav MV” [81].

After its armor was damaged by a direct hit from a Geno Saurer R's Charged Particle Cannon in episode 44 of the anime, the damaged areas were repaired, and some parts of its armor became white starting from episode 47 [note 18]. For differentiation, the official website at the time of the broadcast also referred to this as the “New Moonbay Specification” [83].

It appeared in the Battle of Red Last in April ZAC 2100. Moonbay successfully completed a transport request from the Imperial Army amid successive bombings of the Imperial Army's supply lines by the Republic Army, which had air superiority [84].

It traveled with Van, carrying a Shield Liger and Command Wolf on its trailer. In episode 52, it was equipped with a prototype booster developed by Dr. D, but because the booster was too powerful, it lost control and crashed into a cliff. Moonbay named this state “Gustav Evolution.” Manga Zoids: New Century Moonbay's machine here is called “Tartar.” It was on the verge of being scrapped but was revived by Moonbay herself.

In Zoids: Evil God's Resurrection! ~ Geno Breaker Saga, it joins the party along with Moonbay. It has better equipment than the standard type, with a vulcan cannon added to its initial weapon rack [note 19]. In the ZOIDS VS. Series, it appears under the name “Gustav,” and in Zoids Tactics, it appears under the name “Gustav MV.” In both games, it is implemented along with Moonbay (although it is not related to the story in the VS. Series).

A modified variation featured on the back of the RPZ-02 Gustav package. It is equipped with various cannons and guns on its body [70]. It also appears with the same name in the game Zoids: Evil God's Resurrection! ~ Geno Breaker Saga. As its name suggests, it is treated as a mobile artillery platform [85].

A modified variation featured on the back of the RPZ-02 Gustav package. It is equipped with a dozer blade on the front and a crane on the back, and is used for constructing fortifications and recovering friendly units on the front lines [70].

A modified variation featured in the advertisement “Zoids Tsushin” (Zoids News) [76]. It is equipped with a crane on the rear of the unit to perform repair work on the front lines. The unit is painted in a field color scheme [76].

One of the camouflage variations featured in the advertisement “Zoids Tsushin” [76]. It is painted in dark yellow and dark green [76].

One of the camouflage variations featured in the advertisement “Zoids Tsushin” [76]. It is painted in sandy brown and gray [76].

A modified variation featured in the school magazine Shogaku San-nensei (Third Grade Student) [86]. Various firearms and missiles are added to the main body. The trailer is loaded with a gun turret [86]. It specializes in a strategy where the Gustav detaches its trailer and moves forward, while the trailer engages enemies from the rear [86].

A modified variation featured in the October 2001 issue of Dengeki Hobby Magazine [87]. It is based on a dragonfly larva, and its body, excluding the head, has been changed to a new six-legged type. It can tow a trailer like the standard Gustav. It was designed to transport SS Zoids, which have a short operating time, and serve as an operational base, but was never mass-produced as the plan shifted to larger transport Zoids [87] [note 20].

The Guylos Empire Army version of the Gustav that appears in Zoids Tactics [81]. The color of the impact-resistant shell armor is purple, the main body is dark gray, and the canopy is green. It is a formally adopted transport Zoid, not a captured unit [81]. Imperial Army Super Ambulance Specification Appears at the beginning of episode 14 of the anime Zoids: Chaotic Century [83]. It transported casualties that arose from the Republic Army's self-destruct operation at Fort Kronos. Imperial Army Zoid Core Recovery Vehicle Appears in episode 26 of the anime Zoids: Chaotic Century [83]. It has a crane storage container and is crewed by people in protective suits. It recovered the cores of Zoids that Raven (Geno Saurer) had destroyed.

Appears in episode 35 of the anime Zoids: Chaotic Century [83]. It is equipped with lodging facilities on its cargo bed. Dr. D and Fiona were riding in it for an ancient ruins expedition, but the cargo bed was damaged during a Stealth Viper attack.

Appears in episode 36 of the anime Zoids: Chaotic Century [83]. The GPS composite sensor part has been replaced with a crane arm. Cunningham used it, but Van found them after they rendezvoused with their accomplice Dorsett, and the Gustav's legs were destroyed.

Appears in episode 39 of the anime Zoids: Chaotic Century [83]. It pulls two large containers and was used by Thomas for an operation.

Appears in episode 46 of the anime Zoids: Chaotic Century [83]. It seems to be equipped with floats on the bottom of its body, and the trailer section has been modified like a deck. It was used by Dr. D and Van's group when they traveled to Lemuria Island.