When were DPF and DEF introduced on RV diesels?

2007 model ENGINES went to DPF and then to DEF in 2010 model engines.....NOT the same for the RV model year. Monaco purchased a bunch of 2006 Cummins ISL and were still using them in 2008 and a few 2009 models. They also purchased a large amount of Cummins ISM & ISX engines which were still being installed as late as 2012, in the larger coaches.