"Coolest Opti dolly ever! I even got into the Opti and sailed down the road. But on the technical side, it is a great teaching tool. It helps with helmsmanship, sail trim, weight displacement (a little), and forward facing tacking drills. I would also recommend purchasing the straight dolly conversion kit from training dolly to real dolly ($200.00). "
Might consider adding a strap to go with dolly. Works very well and spins on it dagger as it in the water. Good job in design.