I have towed a lot of trailers to a lot of places trailers shouldnt go over the years.
I offer the Max Coupler line because I have abused the products and they have always gotten me home. I dont sell them because the markup is great, Im friends with the owner or any other BS. The Max Coupler is a simple, reliable system with very few moving(special) parts. They connect with standard 5/8" hitch pins and use a polyurethane bushing. Nothing fancy.
The other popular option here in the US is the Lock-N-Roll. Its a little more complicated of a system. I know a few years ago they had troubles with failing while reversing but Im under the impression they have resolved that issue.
The cheapest, and time tested option is a Pintle Hitch. They are noisy, heavy and dont offer you quite the articulation the others do. But they are cheap and damn near bulletproof.