Obviously stay up.on your recommended services. Diff fluids, cabin and engine air filters, brake fluid, monitor for coolant leaks and watch out for valve cover gasket leaks.
Let's start with coolant leaks shall we, water pumps are an issue, don't think they have fully solved that yet. But be prepared to get that done at any moment.
Then there's the coolant outlet pipes, upper and lower in the front of the engine. You will need to lift or remove the supercharger to replace them. They updated them to a new design. If your pipes have a square flange looking seam, they are the old design and I recommend updating them when they leak, the common place for the leak is at the base elf the lower pipe and coolant will build up in the valley of the engine. There's a couple of spots where you can see it but it's hard to see unless you know where to look. Borescopes make it easy to diag.
Then there's the coolant cross pipe at the back of the heads and connects then together, it's much less common to see it leak, but when it does you will see staining down the bellhousing of the transmission.
Thermostat housing, not as common as the rest but always a possibility.
Just monitor the coolant level regularly.
Oil leaks, valve cover gaskets, timing covers, upper and lower will eventually leak, just because of the design, but that shouldn't be for a long time. Just monitor it and have it properly inspected during service.
Supercharger coupler issues have yet to be fully cured using dealer parts, I recommend when it goes out to replace it using the solid Delrin or plastic aftermarket replacements as a permanent fix.
AC problems, well really the only thing you may suffer from is that your vehicle takes a long time before the ac gets cold, it's the spool valve in the compressor, don't dick about replacing the valve, just replace the compressor.
The 2014+ engines despite having the updated rails and guides are still vulnerable to noise issues. Timing gears may make noise later on, it's hit or miss. And also the tappets still suffer from wear issues. These two typically indicate poor service history, so as long as your on-top of it you will be fine.
Oxygen sensors are an issue still with the 2016 model years.
Now onto model specific issues.
Typically the full size is actually pretty decent, not many issues really. Air compressors aren't common anymore but aren't out of the realm of possibilities. Air springs haven't started failing on me yet. Keyword, yet.
Front lower control arms are still an issue, like any full size since 2003, I like to consider them wear items these days.
Your car shouldn't suffer from any infotainment issues. I believe those started in 17-18.
Shifter failures aren't unheard of though, but not common.
This may seem like alot of issues. But it's really not. Overall you should have a decent rover there. The 3.0 is just the 5.0 without the last cylinders bored into the block. So it's still vulnerable to the typical 5.0/3.0 issues. But other than that I think the L405 is a vast improvement over the l322 trucks. I would keep it if I were you.
Atleast you didn't get the diesel. I don't care what anybody says, those motors are trash. I have a stack of connecting rod paperweights as proof.