Truck idles a lot. I keep after the drivers to turn the engine off when possible.
Drivers are pretty responsible and I do not believe they are overrevving the engine.
Five speed Eaton Fuller tranny.
All the tests the lab has done is on the results sheet. They did not do a particle count.
I use a Fleetguard Stratapore filter but not the one you listed, Cummins recommends LF3970, so that is what I am using.
I had high Cr and Al numbers on a UOA a couple of years ago, before ULSD.
I add Howes Diesel Treat in the winter and add TCW3 2-stroke oil in the summer. With a ditributor type pump, lubrication of the injection pump is critical.