T92 Howitzer Motor Carriage
The 240 mm howitzer motor carriage T92 was a self-propelled howitzer developed by the United States during World War II. The same mounting with the 8-inch gun M1 was developed as the gun motor carriage T93. Neither was built in significant numbers and the war ended before they could be used in combat.
Source: Wikipedia — T92 Howitzer Motor Carriage (CC BY-SA 4.0)