High Quality Content by WIKIPEDIA articles! The T28 super heavy tank (also called 105 mm Gun Motor Carriage T95) was a prototype heavily armored self-propelled gun designed for the US Army during World War II. It was originally designed to be used to break through German defenses at the Siegfried Line, and was later considered as a possible participant in an invasion of the Japanese mainland. Sometimes referred to as a super-heavy tank, the T28 was re-designated as the 105 mm Gun Motor Carriage T95 in 1945 and then renamed a super heavy tank in 1946.