This UOA shows why long ATF OCI's are not good.
Practice a more frequent ATF OCI(simple drain/refill) every 6 months.
OEM ATF cooling is inadequate.
Even optional tow package OEM ATF coolers are small that are added usually inline with the 'radiator' cooler. What I'm saying is that dealer/MFG 'tow packages' are just adequate for daily driving. Tow package ATF coolers should be standard.
Since you're really towing, I'd consider a upgrade to the tow-package cooler. All you need to do is measure the ATF cooler, purchase a larger one, and swap it in.
Also, any suspended wear can cause more wear. Some of thse PPM's of FE/AL/.... might've been filtered out if you had a real filter. Install an inline aftermarket ATF filter.
And, as mentioned already, exercise any recalls/TSBs on this transmission.