Why is it so difficult to back up a trailer?

Posted by tctrailers tctrailers
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Backing up a trailer: The concept strikes terror in the heart of anyone who's tried it. With all of the things that can possibly be hit in the world -- other cars, fire hydrants, pedestrians, buildings -- backing up a vehicle alone can be nerve-wracking. Adding a trailer to the mix only intensifies the nightmare.
This article by Josh Clark provides more information on backing up a trailer.
http://auto.howstuffworks.com/auto-parts/towing/vehicle-towing/trailer/difficult-backing-up-trailer.htm