KW-- writes: "Side views should be adjusted so that you can see just a
bit of the van reflected as a visual reference point."
>>>>>>>>

>Typically not, unless you have two convex mirrors.

I disagree with the latter.  Without a point of reference you will never
know if your mirror moved out of adjustment until it's (BAM!) too late.
Besides, my Westfalia has a nearly useless rear-view mirror due to the
protruding rear A/C unit.

Chris.