The trailer is a Trailex SUT-250-M2, which I bought assembled and very lightly used.
HERE is the manufacturer's page with additional pictures, accessories and assembly instructions.
It has vertical posts for carrying four kayaks on their sides, which I removed so that I could carry one canoe in the center of the horizontal crossbars. It can carry two canoes up to 17' in length. The canoe shown is a 15' reproduction Morris by Rollin Thurlow. The axle housing and front crossbar can be positioned forward or back on the tongue bar. The 8" tires can be upgraded to 12", which I might consider if I ever pull it long distances.
The trailer is lightly sprung and the whole aluminum thing weights only about 145 lbs., so it's easy to wheel around empty and lift to reposition even with the one canoe on it. I often need to do that because I am the world's worst trailer backer-upper. Thinking of installing a back-up camera above my van doors.
I've been using full size conversion vans to carry canoes on top for 40 years—as many as five canoes at once—but I no longer can confidently and safely lift canoes heavier than 60 pounds alone, which is how I almost always paddle, so the trailer is the practical solution.
I do recommend a trailer with horizontal crossbars like mine to carry wood (or any) canoes upside down on the gunwales, rather than the more common kind of trailer with longitudinal bunks used to carry small powerboats and jet skis rightside up. Carrying a relatively heavy wood canoe rightside up on a bouncy trailer risks stressing or cracking the planks and ribs, in my opinion, to say nothing of catching water in rain.