German WWII E75 jagdtiger II with 128mm gun
It would have been built on the same production lines as the E-50 for ease of manufacture, and the two vehicles were to share many components, including the same Maybach HL 234 engine.
Planned to have a much thicker armour however, and in fact compared to the Tiger II the E-75 had improved hull armour all round. As its name indicates, the resulting vehicle would have weighed in at over 75 tonnes, reducing its speed to around 40 km/h.
To offset the increased weight, the bogies were spaced differently than on the E-50, with an extra pair added on each side, giving the E-75 a slightly improved track to ground contact length.
According to some sources, the similarities between the E-50 and the E-75 went further; they were to be equipped with the same turret and 88 mm L/71, along with an optical rangefinder for increased long range accuracy (German scientists and engineers had successfully designed a 'schmal' or narrow turret and infra-red lighting and sights for use on the prototype [Panther F], as the war drew to a close).