http://www.defensenews.com/story/defense/land/vehicles/2016/02/02/dod-weapons-tester-dote-report-sheds-light-jltv-competition/79703534/
"JLTVs generally also don’t have “sufficient capability” to carry equipment, supplies and water longer than a day-long mission, Gilmore reported. “This limits the types and duration of missions for which JLTV is effective,” he writes,” or will require more vehicles or trailers.
Also, while it’s not a current JLTV requirement, Gilmore noted that the utility variant does not have the same capability as the Humvee Cargo/Troop carrier.
The prototypes also “suffered from poor command, control, and communication equipment integration by the vendor affecting the unit commander’s ability to command and control platoons, maintain situational awareness, and complete mission tasks during the LUT,” Gilmore wrote.
Moreover, because of small rear windows and blind spots, Gilmore noted, the JLTVs do not provide the crews with “sufficient” visibility during missions."