I had two, the first was taking delivery of the 2007 Dynasty(ISL400) we ordered. Coming thru AZ, air govenor went out! Coach Net tries to get 20 different peeps to come out from tows to state police and not a one! Hobbled to camp ground with sir alarms going off and hoping not to lock up the brakes. Fixed next day and nothing else until last week. Sitting a mile from Geo Wash bridge in stopped traffic, low coolant alarm goes off and stops after a few minutes. Got across bridge and on NJ turnpike and stop eng light came on. Pulled off side and turned off right away. Went around back and lifted hatch and watched the water drain off the top of the block out of the water pump bearing. Shouldn't have happened in a maticulous maintained 56K miles. Both of these just my time and no luck, but hey I learn from all issues and next time will have that 3 bolt($140 pump)in my spare parts to be able to change out my self and move on. Cummins said most likely won't need another one again, just one of those bearing failures unexplained, I guess. Oh well, still rather get out and adventure than to not do anything because of a few mech issues.