Ken, here is what I have. . they are on back order right now at Ricksons. . These are forged Aluminum Rims, and Michelin 245/70R-19. 5" . . 12 ply "F" rated... . 4080# @95 psi
I have a 09 3500 now and the Auto is a little high geared. I am down to 9/32 wear, been on 5 years during summers, and I might go to 225/70R-19. 5" as a replacement next year. .
These tires are harsher ride solo but very well mannered towing heavy. I have these for summer then switch to stock tires and rims for winter when not towing.