I've started by adjusting the drop-down tailgate and main rear door, and that's helped to take out some rattle. I need to crawl into the back to listen while someone else drives to assess the wind/road noise, but less rattling is good, at least.

To adjust the lower tailgate, remove the plastic snap-in covers on either side of the tailgate where the prongs are attached that insert into the tailgate latches. Loosen the two bolts on each side (maybe 12mm?), then latch the tailgate and push forward firmly on each side, tightening up the bolts as you're pushing, to get them into the right place.

To adjust the main rear hatch, either go in through the access hatches on each side at the back or (what I did), pry out the little rubber stoppers on the larger rubber bumpers that the rear door rests against (about a quarter of the way up) and use a T30 bit to extend or retract the bumpers to get a solid, even fit.

I realize this description may not help much, but I didn't document it enough to do a DIY, and there are plenty of videos on YouTube about it, but wanted to at least give an explanation of the steps taken so far.



Next, I think, is to spend some time in the back seats and cargo area listening and feeling around while someone else drives to see where there's problematic noise or vibration.