I went to michigan and bought some trailers, where I discovered a lot of michigan multiple trailer rigs used what they called "fish mouth" hitches, which are kind of like that.
They start on page 31 of this Holland hitch catalog. The thing that surprised me is that they have very low tongue weight ratings. A lot of ag stuff uses pin hitches, but it's usually not that heavy. If you do it, you need a lot of slack, or a swivel mechanism, or it will tear off when you get on uneven ground. I liked the "drop jaw" type pintle hitches in this catalog.
http://www.safbenelux.nl/files_content/HollandCouplingProducts-en-US_2.pdf