
But the greatest drawback is cost which translates into production, resulting in short supplies. Although it is often assumed that heavy tanks suffered inferior mobility to mediums, this was not always the case, as many of the more sophisticated heavy tank designs featured advanced suspension and transmission precisely to counteract this drawback.

Heavy tanks achieved their greatest successes both fighting other, lighter tanks, and destroying fortifications with their very large guns. The line was drawn by each country's army according to its needs very frequently the threshold was based on the weight sustainable by the country's most common bridges or by railroad loading limits. There was not a consistent line distinguishing heavy and medium tanks.
