4Runner stock "WDH"

Toyota site lists the 4Runner V8 version as having a "weight distribution" hitch as part of its towing package. I researched this best I could on the web and local dealer, but no luck. Somehow I find it improbable that they would deliver the 4R with a true WDH, at least in the way the term is used around here.

Could they really mean WDH? With bars, levers, chains, etc.? Gotta wonder if they are using the term to imply a heavier duty but really ordinary receiver hitch. Anyone know what comes from Toyota? In any case, I don't want to order a 3rd party hitch only to find that the 4Runner arrives with the same thing as part of its tow package.

Any help appreciated. I'm confused.