>do I need anything else?
>what is the WD??? how doesit work? do I need it?
When you hook your Globetrotter to your Jeep you are adding 300lbs or more to the back of the vehicle. Like putting half a dozen 50lb bags of sand in there. If you look from the side, the tow vehicle will be low in the back and high in the front. This has a bad effect on steering and stability.
Using a properly adjusted weight distributing hitch shifts the load such that the front and back axles, and that of the trailer share the load.
Your vehicle is now even front to back and much more stable.
You need it.
>what is the Sway Control? how does it work? do I need it?
Certain conditions, gusting crosswinds for example, can cause the trailer to be pushed to from one side to the other and back again. This can set up an oscillation where the side to side movement self-reinforces. This is no fun for the driver. In bad cases it's no fun for the screaming passengers either.
Sway control makes it harder for the trailer to swing from side to side.
You want that too.
>thanks for your help
>anybody with pictures of these devices?
The Equal-i-zer is a popular hitch which includes sway control. See more at http://www.equalizerhitch.com/
Another popular one is from Reese, at http://www.reeseproducts.com/
If you are feeling spendy there are several more expensive options, The Hensley Arrow and the Pullrite, but then you are into four figures.
Hope this helps,