imported post
Blue Winger....
the first of the two employs a similar system to the one used on the Squire Watsonian that I have and what I like is that if I want to carry a rack on my hitch, instead of the trailer, it fits right on and is static. The second one featured would require the removal of the swivel to use the rack that I have ( which fits on to the ball of my hitch). That said, if you happen to tow more than one trailer at different times then the swivel is there to cover any trailer's use.
I know that often, folks recommend the trailer tongue to be extended and the video says that the first one does give about an extra 6" to the length of the tongue, so that may be some advantage, without the necessity to do welding to the existing box section tongue.
The second one appeared to have a bend in the flat bar, thus lowering the position of the ball when re fitted, this may be an advantage or disadvantage, depending how your particular trailer lines up on the horizontal behind the bike.