friends of mine they were towing down to Kentucky lake and had pulled over due to high winds. The high winds pulled the boat off the trailer and this is the result. these are well experienced sailors who have towed this trip often.
don't know as I was not there, but I have sailed with these guys for years so I cannot imagine it not being strapped down. If the wind was sufficent it might had broken the buckles or s hooks. I will be talking to them today. We are going sailing, but I guess we will have to use my boat.
after talking with them over the weekend and seeing the trailer the boat was securely fastened down. The wind basically straigtened out the s hooks when it took the boat. the trailer was turned on it's side, but once the boat left it the wind was not interested in the trailer.