I've got a 2017 with only 82k miles, but am in a similar wagon. I sometimes have clatter at startup (not an exhaust leak, yet), which I think may be due to a suspect oil filter once in a while. Other than scheduled maintenance, my current plan is:
(1) Maintain 5k mile oil change intervals or less (I've been doing that since around 46k miles, should have done it since I bought it at 17k miles)
(2) I drained/filled transmission fluid with ZF fluid at 50k miles, and plan to do every 50k miles.
(3) I started adding Lubegard to my oil changes at 73k miles, plan to keep adding full dose each change
(4) I've been running Mobil 1 5W-20 since the short OCIs prohibit top tier oil, but the start-up clatter and other barely perceptible noises, plus reading here and my warm location have me wondering if I will soon switch to 5W-30. Once I make the switch, I'll stick with that weight rest of the truck's life.
(5) I've recently decided to adopt
@Burla 's practice of draining and re-filling the radiator once a year (or about every 20k miles), just to keep the cooling system in best shape.
That's my plan so far. It's still evolving too, so who knows what will change. So far, other than the very rare clattering, it's been great. The transmission did start to make a strange kind of sound on 1-2 and 2-3 shift when cold at around 70k miles, but it stops once it warms up a little, and there are no other indications anything is wrong. I have the transmission heater bypassed with a plug, so it is slow to warm up. I might have to get that looked at by a transmission shop, but seems low-priority for now.