My trailer is galvanized steel and has an adjustable wheel attached to the front of the tongue, making it even heavier.

My mast rotation was NOT locked down, intentionally. I thought that was the proper technique. Jennifer Lindsey, the engineer on the spot, believes a "free" wing mast sets up an oscilation that adds to the instability. (Think about that bridge that shook itself apart in the U.S. back in the forties.) She also suggests a much wider base for the tie-downs, such as many of you have suggested.

<img src="http://www.catsailor.com/forums/images/graemlins/blush.gif" alt="" /> After my boat had been righted (by Fred and Jennifer), it blew over again! Right in front of me! I did not think the wind was excessively high at that point, maybe 15-20, but the boat was not tied to the trailer. It was just sitting on the beach! IMO, if the wind is over 15, the boat needs to be tied down, or someone needs to be sitting on it. Even while rigging.