GoHaRu.com features an article devoted to Panzerkampfwagen E-100 (Gerät 383) (TG-01), an example of a German super heavy tank, which was developed at the end of WW II.
"During work on the “E”-class tanks many new technologies were developed, however they were never put to use until the 60’s during tank development for the Bundeswehr. As it was mentioned before, shortage of materials made production of even small batches of these tanks was rather problematic."
Along with historical backgroud of this German tank, the info-source provides opinions of experienced players and developers about E-100.
Read about E-100 at Goharu.