Hmmm...
I can parallel park a semi-truck with a 57 foot trailer using only the mirrors.
I must have been doing it wrong.

ETA: It was part of the test when I got my CDL this year.
Very nice! Congrats on the CDL.
I'm not quite as skilled, having only a Class B CDL, but I, too, can parallel park a 40-foot bus (or straight truck), using mirrors only (there really isn't much to see, other than the headrest of your seat, if you try to turn around and look backwards, particularly on a bus).