(Prenote: This time i keep the numbers away, because its not about the 2 made, but about the Last Modified version with a 37mm and a 75mm gun instead of only 75mm and Mg.)
After Germany lost World war one they were bound to the treaty of Versille, which prohibited them of haveing a big military force and development in Military Aviation and Land equipment such as planes, tanks and Cannons. So they developed them in secrit and gave them false names, as such they called them like agraculture vehicles like the Großtrakto or Leichttraktor or just made false numbers like the 8.8 cm Flak 18 which was developed much later but given the numer 18 to look like it was developed at the end of WW 1.
In 1926 multiple Companys such as Rheinmetall Borsig were commissioned to develop a 20 ton tank. The vehicle was called Großtraktor (Large Tractor) and was developed simultaneously with the Leichttraktor (Light Tractor). The prototypes were scrapped or turned into exhibit in 1937 due to beeing outtaded and haveing shown what the “real way” of tank developing should look like.
The Großtraktor was designed as a heavy breakthrough vehicle. The Armarment was the 7,5 cm KwK 37 L/24 which was later used on the Pz IV and a 3,7 cm KwK 36 L/45 which was later used on Pz III’s and as Infatry AT guns. Against Infantry the Großtraktor was fittet with multiple machine guns, one in the hull and one in a small turret over the transmition at the back. The approximate weight being 16 ton. The engine was a six-cylinder engine, The BMW Va Airplane engine making 240 kw.
I would welcome it if there is more data on the Armor thickness layout (If you find anything feel free to post it.)
Why it should be in game: Its a Heavy tank for rank I showing the early German steps to Tank development, it has sloped frontal armor and combines Firepower, Turret speed and overall speed, while beeing a big “target” bringing an unique playstile like the Nb.Fz (which is still somewhat different as it has a bit more armor but slower and even bigger) or the T 35, T28 (which has gotten the suspention of the Großtraktor) or the A1E1 Indipendent. and would give a nice Pair with the Vs.Kfz.31 Leichttraktor Rheinmetall https://forum.warthunder.com/index.php?/topic/481045-vskfz31-leichttraktor-rheinmetall/
Fitting at Rank I Br 1.3 (like the Nb.Fz)
Multiple sources state that it only had a 75mm gun but these pictures clearly show the 37 mm Coaxial gun.
Manufacturer Rheinmetall, Krupp, Daimler
No. built 6
Weight 19 tonnes (21 short tons)
Length 6.6 m (21 ft 8 in)
Width 2.81 m (9 ft 3 in)
Height 2.3 m (7 ft 7 in)
Armor 14.5 mm Hull and Turret Front. 14.5 mm Turret all around. 2x 14.5mm Hull side plates. Belly and Top 10mm.
Main armament One 75 mm KwK L/24 one 37 mm KwK L/45
Engine BMW Va 6-cylinder About 320 PS (240 KW)
Suspension * coil-spring suspension (Rheinmetall, Krupp)
Operational range 150 km (93 mi) on-road
Speed 40 km/h (25 mph) on-road
Sources: BMW Classic - Recherche-Client