During the first Gulf War which was known as the Iran-Iraq War, the Iraqis used an unusual armored vehicle which weighed hundreds of tons and mounted a huge caliber mortar that fire rocket-assisted shells. Essentially, this was an enlargement of the WW2 German Sturmtiger that fired rocket-assisted 380mm shells!!! But the Iraqis made this thing with 8 tracks (48 road wheels) to support the massive weight and gave it an armored cropped pyramid shaped superstructure. It was powered by a rumored high-hp turbo-diesel engine but still was sluggish. After Iran, the Siege Bot went into storage. By ODS, the US Army and AF were aware of the machine and it was a target. But it was never used in that conflict and seems to have vanished. Rumors have it that the US Army captured it and took it away. It is however, not on the list of serious targets like Project Babylon and the Al-Fao guns. Iraqi military and civilians alike report having seen the weapon as built and used but know nothing of its whereabouts. The Germans, like Gerald Bull (before he was murdered by Mossad), helped the Iraqi Army with special projects. In one of Bull's biographies he mentions knowledge of another SP Gun of 230mm caliber built by the Germans in Iraq. This also was not used in ODS or OIF. Both vehicles existed, but no photos have emerged. Artist depiction below...

http://surbrook.devermore.net/superpics/machines/set_1/seigebot.jpg