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Loading a vehicle or something, by driving up unsupported ramps, puts a lot of "up pressure" on the ball. ??
it is called a Weight Distribution Hitch, or it is also known as a Weight Distribution System. I personally am educating myself on them right now. if you are curious, here is one of the pages I am referencing for my own education : http://www.hitchanything.com/Weight-...tch-guide.html