There were two Versuchsträger vehicles, part of a study for a possible Leopard 1 successor between 1972 and 1985 (jointly with the UK until 1976 using a shortened MBT 70 chassis, then with France for possible use of the Leopard 2 chassis). VT 1-1 (1974) had two manually loaded 105 mm guns stabilized for elevation, VT 1-2 (1975) two 120 mm guns, one of which with a six-round autoloader.
They were supposed to zig-zag across the Northern German Plain, automatically firing their guns whenever they aligned with a pre-selected target from the advancing Red Hordes. Crew of three, MTU/MB 803 RA-500 engine with 1,500 hp nominal, 2,175 hp "burst" for a speed of 70 kph at 43.5 metric tons, plus two electric engines for sneaking and traversing in covered positions. Dimensions 9.06 x 3.54 x 2.04 meters.
VT 1-2 is in Koblenz today. There were also five Gefechtsfeldversuchsträger with dummy guns, but in the end the turretless design was found to have too many drawbacks.