will it fit in your garage straight in? If so, you could try and slide it back off the trailer a few feet enough to get a jack and 4x4 under the transom to lift the tail off the trailer then put stands on both sides with 4x4's to support it. then move the jack under the trailer somwhere to jack up the nose enough to roll the trailer forward until you hit a crossmember, set another jackstand and move the jack, then repeat until the trailer is out. Reverse process to reinstall.
Kind of a pain and make sure you have some help but it can be done. When you do the nose piece you would want to "v" the 4x4 to support the keel on both sides and to help keep the boat level.
It's a thought.
Take care and good luck.