Here is an article about one brand of WD hitches. It has an explanation of how it works and the benefits of WD for heavy loads:

http://www.mrtruck.net/wdh.htm
"Weight Distributing Hitch's will improve your trailer sway, weight distribution, and lower stress for trailer safety."

Please take the time to use the Hot Links as there is a tremendous amount of information on this site and it uses clear photos and explanations.

Red

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2005 Titan KC SE, Helwig, True-Track, ARE MX Canopy