If you look at the 2018 vs 2020 mirrors on the 2500HDs, the way the mirror is mounted at the pillar is different. It looks like they are trying to reduce the obstruction toward the front of the truck created by the mounting. I'd have to drive both to see a difference.
Love the rear coverage provided by the mirrors on my F250 but they do create a big blind spot forward of them. I'm used to it now but trying to teach my daughter to drive and getting her used to them (and turning her head like you do in a car) is a bit challenging.
