I have a 2018 Ram Cummins and can’t seem to keep tires longer than 30k; because I don’t do any towing anymore I reduced the rear psi to 50 verses the 80; I have noticed some improvement; have had 3 rotations but still getting outside tire wear greater than inside the tire; I have been running Michelins on the last two sets; I have 80k on the truck and this is my third set of tires now with no towing and they will need replacement before fall doing about 10k miles a year now; any advice appreciated.