Welcome! We've got a lot of good tips and tricks in our maintenance section. As always, opinions do vary :): https://www.ecodieselram.com/forum/forums/ecodiesel-maintenance.29/
Summary
Chrysler (FCA US LLC) is recalling certain 2014-2018 Ram 1500 and 2014-2016 Jeep Grand Cherokee vehicles equipped with 3.0L diesel engines. The crankshaft position sensor tone wheel may delaminate causing the engine to lose its ability to synchronize the fuel injector pulses and cam...
I'd like to welcome @Tremper126 as a moderator on the forum. He'll be helping us out on the site to control the spam posts and help to maintain the posts/content on the forum.
Glad to have you on team!
Check this for the cord, https://www.ecodieselram.com/forum/threads/engine-block-heater.407/#post-2438
If yours doesn't have it, you can buy one from Amazon:
https://amzn.to/3gf12Dz
Welcome! Keep your warranty, maintain it, and treat it like it's your kid. Not all are bad, but it does have a lot higher failure rate that other diesel trucks.
What were they going to do to fix it for that much money? It looks like it needs a regen.. it sounds like this dealer is terrible. I'd highly recommend getting that truck somewhere else.