I got the Zurich HD from Harbor Freight for our shop. So far, I have been able to force regens on Paccar, Cummins, Mack, and Western Star with it.
I keep it in my mobile techs truck and we have a Jpro setup for the shop. I would spend the 400 (or less with coupon) and see if that helps. We have a lot of the same issues with the bucket trucks and sewer cleaners we sell/service... all idle/PTO time and no long stints on the road to clear them out.