Was the alignment check at the dealership or a shop that knows what they're doing?
As much as the dealership is a one-stop-shop for everything that does not mean they are good at it. Some may be, but overall I would not consider them 'experts' in that field.
My truck was in spec. Good tire wear and tracked straight (no pulling) but the wheel was just a l-i-t-t-l-e off from center. Enough that I'd finally had enough and took it to Firestone. They told me it was in spec but, in addition to straightening the wheel, made some adjustments within tolerance for it to drive better. Sure enough it was better and I was in spec to start with.
I was very skeptical early on when I bought my truck as it had been out for less than a year and many shops (outside of dealerships) did not have the specs for the "all-new" RAM. Now that the 5th gen has been out for several years that's not the case.
Just my .02