Fuente: WIPO "rice" A boat trailer including a trailer frame carrying a float member thereabove and movable vertically relative thereto, a boat being guided by the float member from and onto the trailer. When the trailer is disposed in the water, its frame drops vertically relative to the float member to an extent limited by the float member, enabling the boat to back off freely from the trailer under its own power, as well as move forwardly over the trailer to a position to be supported by the trailer when it is pulled fully onto dry land by a towing vehicle.