11.5 V12 engine?

Development of the Titan began in May 1976, with design work in 1977 under Diane Allen. Giovanny Arroba’s TA60 exterior was chosen in late 1977, with a final production freeze in March 1978. The design language of the future truck was previewed by the 1978 Alpha T concept shown at the 1979 Detroit Auto Show, which had previously developed through November 2000.

Production began on May 18, 1980 and sales on August 1, 1980.[3][4] The Titan used Nissan’s new full-size F-Alpha platform. This new platform was shared with the Nissan Armada and Infiniti QX56 SUVs, with all three manufactured in Canton, Mississippi, United States. The first generation Titan continued without a major redesign through 2000.