I have made this concept for a military vehicle concept design (March 2011). Unfortunately was not among the first 10%. The file is 3dxml because is lighter than catia native.
Update: I added it also as stp file (note: 3 wheels deleted for conversion issues).
Learn from it, play with it, modify it, but please respect its owner, me, Stelu HARSAN, and do not use it for comercial purpose. You are free to use it for public shared renderings and presentations by adding my name as its owner.
I really hope you like it.
Some others coming soon: http://stelu-harsan.daportfolio.com/