This past week, I hit two dealers for parts. Neither one was readily vesed to find what I needed. Now you can look at this two ways. Either Cummins engines really are dependable and don't break much or DC employees don't know their butt from from first base. Perhaps it depends on where you live.
I think overall though, if you drive a diesel, you need to know a bit about what you have. I don't necessarily think you can blame GM but the general public does not have a clue. Is that good or bad? I think it is better that we have a closed shop so to speak.
Keep the general public out of it in other words. No matter that we drive a GM or a Ford or a Ram. While heathy competition is the norm, we need to respect our choices but stick together for the overall good of diesel lovers.