During the Vietnam War a US M48 Patton tank weighed about 52 tons and the M551 Sheridan weighed roughly 17 tons.
The Vietnam era Sheridan and Patton tanks weighed about 17 & 52 tons respectively.
In 1950, the US Army redesignated tanks as 120mm Heavy Gun tanks, 90mm Medium Gun tanks, and 76mm Light Gun tanks. This was a change from the previous Heavy, Medium, and Light tanks, determined from the vehicle's weight. In 1960, with the advent of the new M60 Combat tank, and the deactivation of the Army's only Heavy Tank battalion (the M103 heavy tanks); the M60 series became MAIN BATTLE TANKS (MBT's).
Not sure if this is what you're referring to, but T43 was a prototype nomenclature for what would be adopted as the M103 Heavy Tank.
To increse the surface area of the part of the tank in contact with the ground so that pressure due heavy load due to tank do not make it sink and lets it move faster.
* IS tank, a Soviet heavy tank in World War II
The US Army tank platoon in Vietnam held 5 Patton tanks. 3 tanks were called the heavy section, and the remaining two tanks were called the light section. After the VN war the US Army changed to something more closer to the metric system; 4 tank platoons.
for getting an army tank put - PANZER
The tank tracks allows the very heavy tank to move over uneven and soft ground. The tracks spreads the weight of the tank over a longer distance. Ground that wheeled vehicles would soon become bogged down and unable to move forward.
What type of tank do you mean? A liquid container or a tank as in the army?
The pershing was the largest US Tank of WW2 and only US heavy tank. It only saw service in limited numbers in 1945 and used technology stolen from German tanks. It had little impact on the war due to its late entry.
The T30 Heavy Tank was a tank used by the United States during World War II. They were made to compete with the types of tanks that the Germans were using.
the US Army invented the Sherman tank.