Yikes, sounds like you got a bad one.

Long term, my experience has been different. My small company has 6 Rams, 2012- 2018 one 1500, three 2500's, one 3500, one 5500 and the only problems we have had were the gas motor manifold bolts. I deleted the DPF system on the 5500 after 180,000 miles because it was just beginning to give us problems. I fully believe we are "lucky" because we purchased the long term warranties on 3 of them and of course, never needed it.

I hope you have better luck in the future.