We took our trailer out for the first time since purchasing our cummins late last year. Since this is my first diesel, right off the bat I was impressed with the pulling power of the cummins engine. I had to check the mirrors to make sure the trailer was still behind me. It sure is nice to have plenty of power and then some more in reserve. What really impressed me was the use of the tow/ haul feature along with the engine brake. I can't believe how much brakes you can save when using these together. Coming home and back down the grade was a breeze. I experimented with down shifting the transmission myself along with using the engine brake, this worked great. What really made me smile was leaving it in drive with tow/ haul and the engine brake engaged. The engine would downshift as needed while i backed my foot off the pedal and the engine brake would keep kicking in and slow things down. This combination is a very nice feature, which I really enjoyed. I hardly had to use the brakes at all. Overall between the power, and the transmission with engine brake, towing is now a fun thing to do. I am so glad i finally made the jump to this Dodge truck.