I think extending the bunks on jet ski trailers is kind of a janky solution personally. You also need to make sure the bunks support the boat all the way to the transom too because highsiders are prone to cracking behind the rear bench if you don't. You can buy trailers directly from the custom gheenoe shop in Titusville. I havent looked lately but they used to be about 700 bucks for a galvanized one. I'm sure that's gone up though since I looked at them.