Trailer Balls and Switch Balls: Lots More Information

Sources:

eTrailer.com. "Tips on How To Tow a Trailer." (10/17/2008)http://www.etrailer.com/faq_trailertowtips.aspx
Jackson, Jeff. "Mount & Tighten the Ball of a Trailer Hitch." (10/16/2008)http://www.expertvillage.com/video/118282_mount-tighten-ball-trailer-hitch.htm
Jeep. "Jeep Grand Cherokee Trailer Towing." (10/16/2008)http://www.wjjeeps.com/trailer.htm
Sierra Nevada Airstreams. "Hitch Parts." (10/16/1008)http://sierranevadaairstreams.org/owners-guide/maintaining/hitchparts.html
TrailerHitches.com "Switch Ball - 2 and 2 5/16 Inch Hitch Balls." (10/17/2008)http://www.trailerhitches.com/hitch-balls/specialty-&-heat-treated-hitch-balls/switchballtrade2and2516inchhitchballs.cfm
Truck Stuff USA. "Trailer Hitches & Towing." (10/16/2008) http://www.truckstuffusa.com/hitches---winches-hitches.html

How Trailer Balls and Switch Balls Work