cool things with wheels, since 2006
In fact, it was the largest helicopter ever built!Info from Wikipedia
Soviet Mi V-12 First flew in the late 60's but they only built preproduction types. It worked just fine and had a 55,000 lb payload- more than a current C-130. It most likely had no practical use but was one of the many Soviet efforts to prove they were the equal to or better than the west.
https://en.wikipedia.org/wiki/Mil_V-12 Only two prototypes were built