When I was still working we ran those B series cummins in our straight trucks and small single axle delivery tractors. Best small diesel out there. Nothing rougher than stop and go delivery all day every day with every type of non driver you can find. Only problem we ever had on the newer ones in 2010 and 2011 was the EGR valves and they got that straightend out pretty quick. Easy 500,000 mile engine if taken care of. My brother in-law has one with over 200,000 never been to shop. His 7 fords live in the shop.