the Ram dually has a monitor system, it will show you the tire PSI but will not set of alarms of the tire goes flat. I think under 10K gvwr requires the system that alerts you if a tire goes flat.
also know on the ram dually the inside rear tires Pressures transmitter use a different frequency. If you put a rear inside tire on the front, it will still show up on the inside rear position on the dash.
With steel wheels I used to X front to rear outers. (if you think about it, since the rim mounts different on front VS rear, the rotation the tire turns on road is still the same direction when you X them).
Now with a AF 990 loaded for a week, I will run 80psi front and somewhere around 65-70 rear. I know the sticker shows 65 max load in rear, but the 70 seemed to help with sway a little.
I had a 2015 4wd and now a 2018 2wd, same PSI.