What kinda trailer hitch is this?

[DeTowman]

Actually that is a very common hitch. You can buy it off the shelf and dealers.

It is just a class V hitch that swings out of the way. Nothing else special about it.
No advantage when towing with it.

In fact you can't tow with it unless it is locked in one position.

This correct...it is for the people who have a hrd time lining the ball up with the hitch of the trailer!!!! They have to be close though...