Wow. What a surprise. I am alive and well, retired and hiding out near Port Townsend Washington with the Belhaven 19 and Coresound 17.
I believe my B19 trailer is a EZ loader model EZL80. EZ loader quit making sailboat trailers years ago. Best I could do was an adjustable bunk trailer. Local dealer was uncomfortable with the sailboat part, but connected me to their distributer who knew what to do.
I just finish removing the disc brakes and surge brake actuator as they were badly corroded. Trailer brakes not required in Washington State until you get to 3,000 pound total weight. I'd avoid trailer brakes if not required.
One other thing, I'm using the bunks to hold the boat up, but support the keel on an intermediate wooded support. I tried rollers under the keel but they always flatten under the weight. I float the boat on/off the trailer.
Check your direct messages for my trailer VIN which may help identifying the exact model.
Please post about your build and share some photos.