My diesel has large side mirrors which I find useless for backing. Below the
large side mirrors are 6" convex mirrors, one on each side. I routinely back
the big rig up/down long streets/driveways, around corners, round-abouts, to
loading docks and anywhere else. Try a set of 2" convex mirrors, either
attached to your side mirrors in the viewing area or with a bracket below.

Carl