"The M-110 entered service with the U.S. Army in the early 1960s. It was developed as the T236 prototype by Pacific Car and Foundry Company (PACCAR, Inc.), standardized as the M110 in 1963. The M-110 8 inch (203mm) Self-propelled Howitzer has a crew of five, weighs 62,500 lbs, and has a top road speed of 34 mph with a range of 325 miles."
Source: http://olive-drab.com/idphoto/id_photos_m110_howitzer.php