A good news story from something that could have been so much worse!
It's also worth posting up the brand of the straps - sounds like they did an exceptional job too!
Heres how I strap it down, using the big blue starps you buy at the trucking places, not 100% sure what they are called. (maybe someone knows).
I used to strap with 1 strap over the boat from side to side, Then i thought about it after seeing a boat accident and talked to a few truckies who said that with the one strap over the top the boat would just slip from under the strap, so I have done it like this ever since. (glad i did to) those starps allowed the boat to move about 500mm forward. Plus I have conveyour belt rubber on all the skids which also helped to slow the boat down i think.
Jet