I sort of built my own trailer for my Cal25. I didn't use a very scientific method though. I searched the internet for pictures of Cal25 boats on trailers and came up with a rough idea of the minimum trailer length that I could get by with, and then went out and purchased a used powerboat trailer that was long enough, and modified it. I didn't have my Cal to get measurements from. It was in San Francisco Bay and we live in West Florida. I made adjustable stanchions out of pipe and adjusted them to fit after the boat yard lifted it out and set it on the trailer. Since then we have launched and recovered it with no problems, although I do intend to add guide boards to make it easier to insure that the keel is in the right position before pulling out of the water. I don't know how to upload pictures to a thread so I'll upload a few pictures of our trailer project to my gallery incase you want to check them out. Good Luck with your project.
Last edited by Mc51; 01-28-2009 at 02:53 AM.