[Fulltiming]

Newell changed from about 515 HP Detroits and an occasional equivalent horsepower Cat to the 600+ HP Cats in the late 2006 model range. Some of those have been advertised in the $225-$250k range. Newell switched from Cat to Cummins in the late 2010 models. By 2010, almost all Newells would have 4 slides, typically with either all flat floor slides or in a few cases, the bed being in a non-flat floor slide. To avoid DEF, you would need to stay back in the pre-2013 or 2014 range. I don't know exactly when Newell started using DEF engines but I have noted that several 2012's were non-DEF. By 2008-2009, most of the Newells advertised are over $400,000. With the proper hitch, all of the Newells in the 2006 and newer category will be capable of towing at least 20,000 pounds.

The remainder of your list would vary from coach to coach since each one is different.