Definitely don't do that. There should be nothing tied to the cradles.

Why? I can understand why you wouldn't want anything tied to single
props, but what would be wrong with tying a boat to it's cradle
Must admit though, the idea of supporting a boat using guy ropes from the
top of mast, scares the hell out of me, don't know the maths and stuff, but
it doesn't seem right to me.