mp-ray,
It is, always has been, and always will be a confusing issue. Whatever you do, don't listen to the salesman. First, search for the topic "weight being carried versus weight being towed" on the forum. You'll see the definition of the different weight ratings and some good comments from a number of MOCers.
An easy way for some to understand it is vertical load versus horizontal load, or weight being carried versus weight being towed. Find a comfortable way of looking at it so that it's easy to remember, because it's important to the reliability and safety of your equipment, and potentially how you're treated by your insurance company and the police.
Bob
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