Lucasfilm built a 25 ton twin V8 powered tank for the 1989 film "Indiana Jones The Last Crusade." The design of the vehicle was loosely based on a World War I Mark VIII tank. Additional details, side and front view photos and a illustration of the prop tank could at one time be found on the Indiana Jones fan site, Indy Gear. However, all details, photos and a illustration of the vehicle have since disappeared from the site.
Still photos of special effects work involving this vehicle can be seen at "Special Effects by George Giles."
Update: 7 August 2008 - Photos and illustration of the Last Crusade tank can no longer be found on the Indy Gear site. Text updated, links fixed, and new links added.