Bones check your alignment specs on the front end, the specs in the alignment books are incorrect check this out
https://www.thurenfabrication.com/tech/alignment-and-handling.html
I’m not sure if the author of this link just messed up or he’s a little confused? Of the 3 “normal” alignment adjustments done on a typical vehicle (the Ram 3500 falls into this category) toe and CAMBER are tire wearing adjustments. Toe being the biggest offender of tire wear.
The article states caster can affect tire which at that point I needed to do some research to make sure something hadn’t since I went to a tech school almost 50 years ago. If you look up Hunter alignment which is probably the most used equipment out there, they will state that caster is NOT a tire wearing angle. Caster angle is tilt of the steering knuckle either forward or back from a center position. Caster is there to provide a return to center when a person turns either direction. As a result of either positive (forward leaning) or negative leaning you can also affect the heaviness or lightness of the steering.
I only bring this up as up as if I was still in a shop today and someone brought me this article my first reaction is to question the entire article. That being said, I’m somewhat on board with the toe recommendation AS LONG AS the steering components are in very good condition. The reason for toe is to help overcome the natural movement of the parts involved in the steering linkage. If you have zero lateral movement in the steering linkage then zero toe would work. But there is always going to be some movement, so depending on if the linkage is forward of the knuckle or rearward of the knuckle dictates the correct toe-in or toe-out adjustments.
My basic theory on tire wear is this, if all you do is use your vehicle for towing your 5th wheel have an alignment done with your entire rig attached. But few shops can accommodate that so you need to find one or based on your circumstances adjust, monitor and adjust as required to minimize tire. (Yes, my Ram 3500 is only used for hauling. My wife follows me with another vehicle, that I’m not replacing a now $85-$90k vehicle every 4-5 years. I can replace her car at a much lower cost and the fuel economy difference, along with potential parking issues are big perks. Not for everyone but it works for us)