Trailer tongue weight
Fred, I think that you're going to have load the boat on your trailer so that the keel is sitting on the trailer keel board directly over the tandem axles. Then, you have to determine the proper tongue weight which is a percentage of the total weight of the boat. My O'Day 222 weighs 2200 LBs, so I used a regular bathroom scale to check the weight of the tongue with the boat loaded, and the coupler unhooked from the towing vehicle. It was a matter of backing down the ramp and let the boat float a couple of inches either way in order the get the 210 LBS that I needed for my tongue weight. Then, all I had to do is move my trailer winch stanchion back so that the roller is up against the bow of the boat. I did this about two years ago when I bought my new Long Mfg. boat trailer. I used a couple of hydraulic jacks and four of my sailboat stands in the stern, to get my bunks adjusted, and it took me about a half hour and I was right in business. At any rate, getting the keel directly over the tandem axles will put you right in the ball park. Then it's going to take a little final adjustment with a scale to get it right on. Good luck!Joe