Both of your findings are correct. Read this article from the experts in HD trucks. Thuren. This explains the alignment discussion.
https://www.thurenfabrication.com/tech/alignment-and-handling.html
Also the government mandated all this tpms crap so the manufacturers had to make specifications for the idiots of the world. The tpms and the door will tell you 60 psi front and 80 psi rear. Those pressures are way too much for an unloaded truck.
2013 was the last year 2500 that had the light load button that would allow you to run 55 front and 45 in rear. They had to get rid of that for liability reasons because morons didn't know they needed more psi in their tires to pull their 15,000 lbs travel trailer.
So they started just making the truck tell you 60 front 80 rear. The problem with this is that it will ride like crap and wear the centers of the treads.
If you go lower than about 72 rear the light comes on.
You need about 58 front 48 rear. This is what I run in my mega cab. I just live with the low tire light and the chime every time I start the truck. I'm use to it now. At this pressure my truck rides much better, tires wear even, etc. When I haul heavy I raise the pressures according to the load.
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