I would stay away from any type of roller type bunks. Seen to many boats setting on ramps, where they unload them self's. I just replace mine every few years with treated 2x4s and wrap with carpet and make sure that the carpet don't go all the around the 2x4. This will let the wood dry. I staple It down and then go back with roofing nails to make sure it stays. Either make them up and take them with you the next time you go to the lake or river with new screws or lower your front jack all the way down and block up the back of the boat and raise the front jack all the way back up. This works on my Lowe.
Hope this helps.
Billy



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