Having said that....
I did find some very useful ideas, and even a picture of a trailer/cradle at www.hunterowners.com. The picture was in the Photo Forum under the title "Bottom painting under the bunks of an H23". The nice thing about the approach in the picture is that, unlike the approach I used, the temporary supports did not touch the bottom paint at all. You can use this approach if you don't need to get the centerboard down, which I had to.The approach I used was:I built four "tee" supports out of 2x4s, about 3 feet long, with padding on the top. I used "C" clamps to clamp the supports to the trailer. Placed a jack under the front of the keel, jack up a couple of inches. Placed a jack stand under the front of the keel, and adjusted the front "tee" supports up to keep the boat from tipping. Then I moved the jack to the back of the keel, jacked it up a couple of inches, placed a jack stand under the back of the keel, and adjusted the rear "tee" supports up a couple of inches. Repeated the above steps until I had enough clearance between the rollers under the keel and the bunks to get to everything.The whole process was very difficult and stressful! I would wake up at night, thinking I had heard the boat crash over on its side! Lowering the boat wasn't much easier than raising it! But, you are welcome to email me with additional questions if you would like at mike.basham@bellsouth.com. Good luck!