The Medium Tactical Vehicle Replacement (MTVR) also known as the “7 ton” is a series of vehicles manufactured and designed by Oshkosh Defense for the United States Marine Corps, based on a common chassis that vary by payload and mission requirements. There were originally four MTVR variants, this increasing to seven, and then nine variants (plus a sub-variant) as deliveries and development continued. A dedicated trailer and prototype/developmental MTVRs have also been produced. The first MTVRs were delivered in late 1999. All production versions of the MTVR are based on the same 6×6 drive configuration. Production vehicles are armor-ready and have air-conditioning, revised cab mounts and upgraded cab suspension. MTVRs are powered by a Caterpillar C-12, Advanced Diesel Engine Management (ADEM) III 11.9-litre six-cylinder diesel engine that develops 425 hp at 1,800 rpm and 2,101 Nm of torque at 1,200 rpm. All-wheel drive is permanent and under highway driving conditions the torque split is 32% front, 68% rear. The MTVR weights in at 12,610 lbs, has a range 300 mi and a top speed of 65mph. It is able to haul up to 14,199 lbs off road and 30,000 lbs on paved surface.