I don't like my boat laid on the keel. But my boat's diferent I guess...
I rather not stress the keel box, with vertical forces, because its stiffened up for lateral forces and swings, that's why.
So when dry, my boat's on a craddle and the keel is suspended. Another problem is if we laid her on the keel, the side stands would have to be 10 foot long, and little stability would be provided by them.
Also there is almost no vertical surfaces under water, so the stands have nothing to support, and would in fact support some weight.
I need a cradle, no matter what.
My boat touched the bootom this year when we were anchored in Culatra, and listed 4 inches, but it was OK. No problem..it was still floating...