Engine Exhaust System problems of the 2012 Dodge Ram 3500

I pull a light weight 40' gooseneck trailer, and while driving I noticed the fuel mileage dropped tremendously and the coolant temp stayed around 220deg and I noticed a horrible loss of power which would not let me drive any faster than around 40-45mph! I took it to the dealership and they performed a boost test on the turbo and said that it's supposed to produce 32 pounds of boost but mine was only producing 26 pounds of boost, and then I was informed they could not justify replacing the turbo because it has not thrown a code on the instrument panel, well if you tell me it's supposed to produce one number and it's doing another then I believe that's enough justification to replace the part beings I paid $50,000 for a brand new truck! the loss of power causes traffic back-ups even if I'm in the slow lane! the temp out of the exhaust reaches 800deg's and melts my mudflap and has caused it to start smoldering after I come to a complete stop! I was later informed about the "re-gen" process and was told it would kick in and out of "re-gen" but I don't believe mine has came out of re-gen beings I'm still getting 5mph with or without a trailer! the engine light and abs light comes on numerous times a day an then go off and now the engine light stays on all the time! this is a brand new Dodge 3500 6. 7l turbo diesel 4x4.