I bought these bunk extension brackets at Walmsley Marine in Warren RI. I'm pretty sure that Long Trailer Company manufactured them because my Long Trailer came with similar shorter length brackets when I bought it at Walmsley's and they had the 24" brackets which I needed, in stock.
Unfortunately Long Trailer Co. went out of business.
These bunk extension adjuster brackets are made 2"X2" square tube galvy steel and they are the best I've seen anywhere. As you can see in the pics.
My O'Day 222 weighs in at under 3000 lbs and I was able to get a rough adjustment on the brackets so that I could load my boat on the trailer at the club ramp. The bottom of the keel was 1" to 2" up off the keel board after I pulled the trailer up the ramp.
I placed four of my Brownell's Mfg sailboat stands, two on each side of the stern plus a hydraulic jack under the bow, and lowered my boat so that the full weight of the boat's keel was on the sandwiched pressure treated planks.
Then I used two car jacks to raise the extension brackets on both sides of the trailer just enough to support the boat from side to side, along with a tape measure to get all the brackets even.
I used the boat stands and the jack to lower the boat on to the trailer, and before I go any further I just want everyone to know that I know quite well that boat stands weren't meant to do this but my stands can take the weight of my boat and I even raised the stern of my friend's O'Day 26 with four of my boat stands.
After I got the proper tongue weight for my trailer, I moved my winch stanchion to the proper place on the tongue and then I used the two car jacks again to raise the other extension brackets so that the bunk boards could conform to the curvature of the hull on both sides. It took less than an hour for me to adjust my trailer with the boat sitting on it.
Good Luck!
Joe
