If you do choose the Cascadia go to a Detroit shop first....not a truck dealer. Get them to do a forced regen with a full diagnostic evaluation. All the sensors, NOX doser everything. They should have access to all emissions work done and when and where. When and where DPF were done by who. Cleaned or replaced with detroit rebuilt. Detroit can tell you everything. If the filters have considerable miles on them I'd consider it a no buy. I have a 2012 Cascadia and the only reason I still have it is because I did the entire emissions system. Increased fuel economy will pay for it in a couple of years while trk works making money with hopefully no major problems.