Depends what coach you're after. DEF started to become commonplace around 2009-2010, unless you got a motor that was sitting on a pallet for quite some time that didn't require it. Certainly by 2012 it became much harder to find one without it. Also, 2010-2012 coach manufacturing numbers may have just been low due to great recession recovery. Though I am only speculating and have no hard data to back that up with.
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2008 Holiday Rambler Navigator Bismark IV 45ft
15L Cummins ISX (525HP)
Allison 4000 series in Roadmaster S Chassis
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