sebby wrote:
I went a little different route.  i got two 10 foot 2x4s and screwed them 15 inches apart.  i then screwed two 10 foot pieces of 3 inch PVC to them so that they were about 12 inches on center.  this makes a nice cradle that can bow out a little on the thicker part of the boat.  the other benefit to this is that i throw it on the back of the pickup and now have a very easy way to slide the outback on.   I'll try and post some pictures when i get home.
I did similar on a trailer I had for my PA14. It worked. 
I'm thinking the cushy pool noodle (large size) will work fine.