You still have the problem of how a 180 ton (360,000 lbs) animal can even stand up... much less walk, eat, make little sauropods... that would be something to see.
Then, what is the evolutionary advantage to having a 40 foot, horizontal neck? How does our beasty swallow his forage? Conveyer belt throat? Peristalsis can only do so much... A shorter neck would make more sense unless it was evolved to reach high food.
Bumblebees can’t fly, either. ;)