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More Great Links

• etrailer.com
• Golden Gait Trailers
• U.S. Department of Transportation

Sources

• Eastern Marine Online. "Trailer Coupler Technical Information." (Oct. 2, 2008)
  http://www.easternmarine.com/em_store/tech_info/coupler_tech.html
• etrailer.com. "Trailer Towing Tips." (Oct. 2, 2008)
  http://www.etrailer.com/faq_trailertowtips.aspx
• Patent Storm. "U.S. Patent 6113125 - Ball Hitch Coupler." Sept. 5, 2005. (0ct. 3, 2008)
  http://www.patentstorm.us/patents/6113125.html
• USA Trailer Hitches. "Hitch Classes." (Oct. 4, 2008)
  http://www.usa-trailer-hitches.com/hitchclasses.htm