I don't drive my tractor got on the highway much but recently I've had reason to drive on the side of the state road on a regular basis which I never am too comfortable with knowing how people drive. I hate not being able to control what's coming up On me back there and like to keep an eye on what's behind me.
One day when I was rummaging around trying to figure out what I could use to function is a rearview mirror I came upon one of my old snowmobile hand mirrors. It's nothing fancy by any means but it seems to work quite well for it's limited use. At least now I can see what's back there while it's at a distance so I can get way over without turning my head swerving around.