I currently just cut out a piece of 3/4" plywood to shape and put a bit of carpet over it Then another piece on the other side of the support. This is not recommended although no problems but I don't trailer it far.

I am about to make new supports and it just occurred to me to try a new way to make them. I have not figured out exactly how to do it, but essentially I am going to get some wide (probably 2 or three inch webbing) which I will attach at the ends somehow to the frame of the cradle so the boat makes it's shape and spreads the stress out. Somewhat like a strapping used to sling a boat at a boat hoist.

Anyone ever try this?