4070P seven-speed automatic transmission, TC-541 torque converter and an Oshkosh 30000 Series single-speed transfer case. All-wheel drive is permanent and under highway driving conditions the torque split is 32% front, 68% rear. Oshkosh TAK-4 independent coil spring suspension is fitted to the MTVR, this providing each front wheel with a total vertical travel of 16.0 in and a travel of 12.8 in on the rear axles. The front axle is rated at 16,000 lb, the second at 23,500 lb, the third at 25,400 lb. The MK36 wrecker and MK31 tractor variants have Hendrickson hydraulic suspension on the rear axles. Standard tires fitted to the MTVR are Michelin 1600 R20 XZL and with the exception of the MK36 wrecker variant, no spare is carried. Compensating for no spare is a runflat setting option on the CTIS. CTIS allows the driver to adjust tire pressures to suit both payload and terrain conditions, from the driving seat. The two-piece bolt-together steel wheel rims are fitted with beadlocks for extreme low-pressure operations and tires will remain seated at pressures down to 10 psi. In the event that any one tire should fail totally, a limp-home facility allows for a second axle suspension unit to be raised and secured. Mobility parameters include a climatic operational range of -50 °F to 125 °F. The MTVR has a maximum speed of 65 mph and on-road cruising range of 300 mi. It can climb a 60% gradient and traverse a 40% side slope with its maximum cross-country load. It can ford 60in of water. Turning radius and approach, departure, and ramp breakover angles vary by variant. MTVR variants can be internally transported by C-5, C-17 and C-130 Hercules transport aircraft. The MK23 can be transported underslung by CH-53 helicopter. The original MTVR trailer was designed and developed by Oshkosh to provide a matching trailer for the MTVR truck. Two prototype MTVR trailers were manufactured and tested between May 2000 and March 2001. In June 2005 the U.S. Marine Corps System Command (MARCORSYSCOM) awarded the Choctaw Manufacturing and Developing Corporation (CMDC) a $1.9 million Small Business Sole Source design and development contract for the MTVR Trailer. Oshkosh manufactures and supplies the associated trailers for the MK37 HIMARS resupply variant. MTVR Armor Systems (MAS) Oshkosh promotes the current MTVR armor packages as the MTVR Armor Systems (MAS). The current Standard MAS with Survivability Upgrade (MAS-SU) kit is available for a