The big rigs with the dpfs are absolute junk in terms of dependability. I drive some internationals with the maxx force engines (I know, why put a perfectly good boat anchor where an engine should go?), and they are absolutely horrible on parked regens and having no power. <200k, and some regen once a week. Gotta downshift on I55 with an empty trailer, etc, etc. the older engines with just egr run like scalded dogs.
DP