You can build a cradle --or perhaps better, outfit a trailer, which will lock onto the top of containers. Send the boat deck cargo. But--no assurance of arrival. A friend had a brand new Tayana 57 shipped from Taiwan to Hong Kong--basically an overnight run. All that was left on the deck of the ship were a few pieces of fiberglass. According to the captain the chains came loose in a storm and the boat slipped overboard after it bashed around the deck for a few hours. The liability of the Carrier was 150 lbs Sterling. Nowever, my friend tied up one of the Mersk container ships in Honolulu with a court order, and Mersk paid the full amount of the claim. Yes, the boat had been insured, but not for its full value--after all what could happen in just a few hundred miles?