Re: Bunk trailer to fit sailboat.
A 20 foot sailboat doesn't need a crane, they can be launched. We have quite a few on launchable sailboats on trailers around here (why, I don't know, we have no regular wind

)
27 inches isn't really all that much. You couldn't do it with any generic bracket, but a welder could fab something up without a problem. A couple well place triangles will make a bunk STURDY. If given the choice, a trailer for an inboard might be better, as they have a steep drop in the crossbar for the prop and rudder. Might not. I don't have experience with either.