^^^^ This!!
Weight carrying is just a hitch ball. Your back bumper is a weight carrying hitch of sorts.
When most people think of the word hitch, they think a receiver style hitch. The receiver is what bolts to your vehicle, the ball mount is either weight carrying or weight distribution.
Like Ryan said, the hitch with the weight scale on it you posted is a weight carrying ball mount....
This is a weight distribution ball mount and spring bar set up. (one style anyway)
View attachment 508438
Sway control is usually an aditional bar that goes between the hitch and the trailer frame that you can adjust the about of friction there is for the bar to slide and allow turning. You tighten it up for driving down the highways, and loosen it up for city driving.
Here's a Curt anti-sway bar control kit... The amazon link has some pretty good descriptions for the hows and whys...
View attachment 508440
https://www.amazon.com/CURT-17200-Sway-Control-Kit/dp/B000HLO7QA?tag=wranglerorg-20