When I first got this boat, it was sitting too far back on the trailer, causing it all to be tail heavy. I had to come up with something to lift the boat up so the trailer could be pushed back.
What I came up was to use a beam made from 4x4's, with support pads that fit the curve of the hull. This beam went under the stern, just behind the trailer bunks. A short wooden block would go under the boat, just ahead of the swing-keel.
Drop the nose of the trailer to the ground and support the rear 4x4 beam on blocks so that it just touches the hull and jack up the nose of the trailer. That raises the stern of the boat off the trailer. Then, using a hydraulic jack and the short beam, lift the boat off the trailer completely and reposition the trailer.
Well, that all worked fine, but at some point I would need to get the trailer out from under the boat. Having a jack under the boat would not work.
What I came up with was an "A" frame over the boat. I used a wide cargo strap to sling the boat. The cargo strap came from a truck stop. It has a 5000 lb capacity so I figured it would probably be OK.
I used the same beam under the stern of the boat and lifted the boat off the trailer as before. Then, I took up the tension on the strap, removed the jack and pulled out the trailer. Just to be safe, I put the support back under the keel and blocked that up.
I started re-painting the hull and it's time to get the boat off the trailer.
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