One of the skippers in my fleet built a custom trailer with an integral beach-wheel-dolly. When he pulls up to the lake, he just unlocks the dolly and rolls it (boat and all) down the beach to the water. He launches and retrieves directly off/onto the dolly so his hulls never even touch the sand. When he's done for the day, he simply wheels the dolly back up onto the trailer and locks it down.

It's an ingenious system that works very well. So well, in fact, that IFG blueprinted his design and now offers it as an option on new Isotope trailers.