<http://schema.org/description>
"You may need more than one switch ball to meet all of your towing needs. Is your gross trailer weight really that important? Test your expertise of Trailer Balls and Switch Balls now!"^^<http://www.w3.org/2001/XMLSchema#string>
<http://auto.howstuffworks.com/auto-parts/towing/towing-quizzes/trailer-balls-switch-balls-quiz8.htm>