Mk 31 Medium Tactical Vehicle Replacement (MTVR) Tractor
Mk 31A1 MTVR Tractor Ready to Accept Armor (RTAA)
The Mk 31 7-ton tractor variant of the MTVR family used state of the art commercial technology including an independent suspension system, electronically controlled engine and transmission and a central tire inflation system, which increased the off-road maneuverability and mobility of the vehicle. In addition, this vehicle is equiped with all wheel steering and a sliding fifth wheel.
The Mk 31 was procured as the prime mover for the M970 5,000 gallon refueler semi-trailer. The Mk 31 tractor variant of the MTVR family were intended to replace existing M818, M931 and the M931A1 5-ton tractors in USMC service. The Mk 31 wrecker entered service in December 2006.
Following the introduction of the MTVR Armor System (MAS) in 2004-2005, an Mk 31A1 variant was introduced. Mk 31A1 was referred to as "Ready to Accept Armor" (RTAA). This model had upgraded cab mounts, armored flooring, upgraded suspension, and air conditioning. RTAA vehicles were not considered armored vehicles and were interchangeable with standard Mk 31s to satisfy T/E allowances.
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