I can understand that you haven't check our site very much, go to this section: http://www.nma-fallout.com/tactics/vehicles/
and look for location under tank...
btw...you have to repair it to get it running...
Incase you didn't know what level that is, it's the level where you rescue the Reaver leader. Hey that rhymes<--tough word.
If only I could buy 1000000 of them shells... oooya