2014 Cascadia with DD16 nightmare truck!

I work for an O/O on a 2014 Cascadia with a DD16. Spent a week at a local FL dealer. The truck was stumbling. Hard to explain but when you applied throttle at lower speeds there was almost a hesitation. Instinct had me applying more throttle and then it would catch and almost over rev. They tried everything but finally DD sent them some new software and it is better. I just had to learn to go very easy in the first 3 gears ( 18 speed but I drive it as a 13 speed). I am on the road and yesterday got an emission system red light! I called DD and they can do an analysis of codes in your ECM. Amazing! Code was for a bad NOx sensor. While driving to nearest FL dealer got a check engine light and then it derated to max 55 mph. According to DD next it would have gone to 35 mph and finally 5 mph! DD instructed dealer to do a forced regen. Nothing changed. They installed a new OX sensor and did another regen. Still has the emission light. After 2 hours DD said to replace the whole I box. This is the entire scr system, doc and most of the DPF. Big box that sits under the PS step. Big and heavy. Of course no one has it in stock. Finally they found one in Calgary. I am in Nebraska! Even after offering to pay the $600 air freight it might be here Monday. This is ridiculous. I am sure glad it is not my truck! I am now wondering if the latest problem is related to the stumbling???? How can anyone make money with a truck that will not stay on the road? It only has just over 100,000 miles. Are all the new trucks like this? Is a Volvo any better?

 

It gets worse! Got to Kansas and emission light came on> 30 miles later the check engine light came on. Dealer in Nebraska kept truck for 2 days. They did a regen, changed the NOx sensor and some of the dosing system. Light was still on .Detroit said to replace the whole 1 box. This is a giant box under the passenger step. Has 2 DOC's And 2 DPF's and a whole lot of other crap. Only one available was in Alberta. $600 for air freight. So far it is running OK. That box has a list price of $18,000. Crazy