variety of models. The Reducible Height MAS (MAS-RH) is also available. Installation of armor requires a vehicle front axle and cab suspension mount upgrade, plus a revision to the cab roof gun mount. Air-conditioning is also fitted. From mid-2007 all production MTVRs have been armor ready, these modifications now forming part of the standard vehicle specification. Development of a protection kit for the MTVR commenced in 2003, with the first production contract awarded in 2004 and calling for 920 baseline appliqué APKs for the cab, plus 460 modular armored rear troop carrier compartments. The cab and troop carrier kits, while complementary, are separate units and can be installed as such. A follow-on contract for 930 cab kits and 465 rear troop-carrier compartments was awarded in 2005. Two further contracts for a total of 293 cab kits were awarded in 2007. Oshkosh announced in August 2008 an initial contract award for height reducible armor kits for MVTRs. Around 2400 height reducible armor kits for MVTRs have been ordered. Additional awards for armor/protection-related upgrades have been made. A small arms fire and mine blast protection kit for the U.K. MoD's MTVR-fronted Wheeled Tanker fleet has been developed and fitted to vehicles used on overseas operations. Gallery Prototype and developmental MTVRs Two each of 6×6 and 8×8 prototypes with Hiab load handling systems have been built. The 6×6 chassis are 9/14 ton (8,165/12,701 kg) on-/off-road rated, while the two 8×8 prototypes are rated at 16.5 tons (14,967 kg) and 15,000 kg payload. Both 8×8 chassis are fitted with a tridem rear axle layout, the rear axles (of which axles three and four steer) sprung hydraulically. Two 4×4 variants have been developed, the Short Bed Cargo Truck and Lightweight Cargo Truck. The Short Bed Cargo Truck has a high degree of commonality with the 6x6 MTVR, while the Lightweight truck is aimed at the opposite end of the payload/capability scale, this variant being fitted with beam-type axles and a simpler leaf spring (front) and airbag (rear) suspension set-up. A four-door crew-cab option is available for longer wheelbase chassis. A European-friendly forward control (with the engine mounted behind the cab) variant of the MTVR, designated as Z Series, has been built. In July 2005, Oshkosh was awarded a five-month contract from the Office of Naval Research for the first phase of a four-phase project to develop an MTVR with a 60 kW on-board power generating