I have the same thing, 2012 Laramie bought new now with 165K. Noticed the ticking at around 60k. Brought it into the dealer and they mentioned as you already know, the "hemi tick". 100+k's later and there's no difference, runs as good as it did on day 1. I wouldn't worry about it if it's the engine but would investigate if it's something else ie exhaust.