I provided information regarding the advantages of the Oshkosh MTVR so to be fair here is some new information I found regarding the Stewart & Stevenson FMTV.
The FMTV, which DND has supposedly wanted from the begin, is a 2.5-tonne 4x4 and 5.0-tonne 6x6 truck. I have been trying to follow the development of the FMTV on the company's website. I now see that the 11-ton technology demonstrator and the 9-tonne Load Handling System are being produced, the dump truck variant is now available in 5, 7.5 & 10-tonne versions, and there is also a new 17-tonne 8x8 heavy variant.
So the FMTV is also a very good candidate to not only fulfill the MSVS Replacement Project but also replace the HLVW and VHLVW someday. Even the 11-tonne and 17-tonne variants have 80% commonality. There are 2.5-tonne cargo and van models; 5.0-tonne cargo (short or long bed, with or without material handling crane), 1,500-gallon water/fuel tanker, expandable van, wrecker (same axles as the 10-tonne dump & cargo variants)and tractor; 9-tonne Load Handling System variant; 10-tonne dump truck and 17-tonne cargo. A tilt-bed version of the 5-tonne has also been developed to transport the M777 lightweight howitzer rather than towing it for improved mobility and the HIMARS launcher is also based on the FMTV chassis.
This range of vehicles would easily replace all the MLVW, HLVW and VHLVW. I assume that variants of the new 11-tonne and 17-tonne versions will be developed in the near future such as tanker and load handling systems.