Both mirrors turn 90 degrees away from the truck. I'll hook up the trailer later this week and see what I can see. Looks to me it might be enough, but a road test will be the way to know. I'm sure I've seen other trucks with the mirrors set up in the out position, I just never paid enough attention and focused to realize what a simple thing it is.
The previous owner - original owner - bought it to tow a camper. I had a copy of the original window sticker but I don't recall anything about a mirror option.