I believe that Newmar 2011 Ventana, Dutch Star and Mountain Aire model year DP built on Freightliner chassis will be powered by 2007 emissions Cummins Diesels. Newmar entered into an this agreement with Freighliner because they were able to procure enough pre-2010 emmisions Cummins products for thier chassis to support Newmar needs for the up-coming model year, Freightliner also agreed to solving the problems that were experienced by Newmar previously with Freightliner Chassis, and agreeing to incorporate "Comfort Drive Steering" on the chassis provided to Newmar , therefore Newmar committed to a shift to Frieghtliner Chassis for the above mentioned 2011 products.
Here is are a couple of links that explains why Newmar did this:
APRIL-2010.pmd
APRIL-2010.pmd
Spike