Those the OEM tires? Have read several forum posts about the Ram tires not being good for long mileage...no personal experience. Nexen? brand.
If the dealer says it is ok, then you need to go to a competent alignment shop and get a second opinion, being able to show them the wear pattern.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired