canted wheels on a trailer?

I'm building my own trailer, of a design similar to this one:

http://drumbent.com/trailer.html

I've noticed that some commercial trailers (and racing wheelchairs) have
the wheels canted toward each other at the top. It's said to improve
handling, but I don't understand why. Can someone explain the thinking and
whether it's a good idea for a cargo trailer?
.

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