Saw this thread revived. I was the OP. From my experiences, start by making sure you have no water leaks. The A/C drain is a common fix, you can find a replacement part here:
https://www.tascaparts.com/oem-part...bpW5McLP9boNnbWrNr49MvqfPT0s0cQwaAmrfEALw_wcB
Some people experienced water leaking in the cabin from the faulty design of that drain. This lead to moldy smell in the cabin and potentially the A/C vinegar smell.
I also removed the cabin air filter, turned on the A/C on high and sprayed Lysol in the intakes near the windshield wipers. Also sprayed some up in the cabin filter compartment when it was removed. I did this several times. I plan to do it again the Spring when the weather warms up.
Finally, simply replace the cabin filter a couple times annually.
I conceded this is all simply moisture condensing or building up in the vents and then molding. More moisture in the cabin means more mold. Some folks turn off their A/C a few minutes prior to turning off their truck (or car) - it all comes back to limiting the moisture build up in the vents and cabin.
BTW - yeah, it’s a $70k truck and all that so WTF. But keep in mind it’s a really large cabin space, and in researching I saw this in a lot of vehicles with large interiors - SUVs and trucks. Hot outside and a large interior getting cooled by impressive A/C systems leads to condensation. At least that’s my guess.