Acco Grader

Acco built the biggest motorgrader ever. I have read, that they built two types. The prototype is the 6 wheel grader and the other one has 12 wheels.

Here the one which has 12 wheels:
http://ift.tt/1nJgpGr

And the other with 6 wheels:
http://ift.tt/1nJgpGx

Does anybody know what happend to both?
The one with 6 wheels has lost some parts

Acco Grader