Would two cradles be sufficient, or would you suggest three? I'm thinking about making a frame with cradles that I can secure in the back of my truck. That way I won't have to find a trailer, as long as it works properly.
How long is your truck bed? The Sunfish is 13'.9" long, in an 8' bed, leaves almost 6' over hanging (un supported?). Unless you are building racks to go over the cab? I would put at least 3 cradles, the last one would be picking up the overhanging part.
But that is still a heck of a lot of over hang, someone could hit it.