Elwoodj, The dual mass clutch systems in the Dodge leaves much to be desired! Consider yourself lucky to have made it that many miles, especially when doing heavy towing! I "smoked" mine while driving (with 5 yards of gravel in my dump trailer) down the highway, While accelerating to pass a slower vehicle. I had done some exhaust work and a power upgrade, and had "way more" power than I had clutch!
There are several aftermarket clutch systems available for the Dodges. They are designed to handle much more torque and horsepower than the stock clutch. The only drawback is noise! They are noisier than the dual mass system (which is explained in the clutch information).Southbend and Valair, come to mind. We went with Valair. There are clutch systems of different designs for different power outputs. If you do any power upgrades to your Cummings, an aftermarket clutch is a must.
Cummins Forums is a great source of info for all Dodge related topics. Good Luck, memtb