This was on the dodge website for the 09 C&C trucks. When the 07 C&C's came out they only advertised meeting the 07 emission standards.
Jobsite idling
Dodge Ram 4500 and 5500 Chassis Cabs have low enough emissions that they can idle indefinitely at a jobsite, letting you use their HVAC and electrical features. This is because Dodge Ram 4500 and 5500 Chassis Cabs meet the 2008 Air Resource Board's state diesel emissions standards for medium-duty trucks (which includes CA, CT, DE, GA, ME, NJ, NY, NC, PA and TX). So you can let your truck idle while Ford and GM owners have to automatically shut down after idling five minutes or risk fines in these states.