Ram MegaCab with slide-in truck camper

The new 6.7L Cummins Diesel (2013 and later) have extended oil change intervals (15,000 miles between changes) so that's a big savings over older 6.7L and 5.9L Cummins. Also 2013 and later (I think - definitely 2015/2016) have the DPF and SCR exhaust emissions system which takes alot of the emissions stuff off the engine. My 2015 6.7L Cummins with the 68RFE Transmission has the tow/haul mode combined with exhaust brake which can be set in either Automatic (maintaining downhill speed using the exhaust brake) or FULL which brings everything down to about 15MPH without using the brake pedal. I disagree with the above post stating the need for loads over 10,000# to justify the diesel exhaust brake. Western roads (California, N. Arizona, Utah, Colorado, Idaho, Oregon, S. Dakota, etc.) have enough steep declines that any load over a few thousand pounds benefits from the exhaust brake. Also, the inclines are an absolute no-brainer with 850-900 Lb/Ft of torque. Unloaded, my RAM 6.7L gets about 22/23 highway and 16/17 city. Loaded with the camper and hauling the motorcycles I get about 16/17 on the flats and 14/15 through the hills. Your call but if I had to do it all over again, I would not hesitate to spend the extra $ on the diesel. YMMV