I'm assuming funds are limited so the reason for trying this, other wise could call a hauler. Going to try a different approach, this will stand a better chance if you can make some bunks. This still is iffy but should work if its built right. At least a 20 ft trailer, longer is better
Can you find a car trailer, preferably without a dove tail. Build a fixture to hold the boat, measurements will be the biggy. I'm thinking the sides will be no more then two feet above the keel, probably more like 16 to 18 inches.
Length if fixture would be to hold boat from stern to forward of amidships, where the hull starts come up. Many boats have sling marks, so they could be used. The fixture will need to be secured to the top of the trailer.
Not telling you how or out of what to build it, only this is the way I would start