Fuente: WIPO "rice" A boat trailer including a trailer frame carrying a float member thereabove adapted to receive and support a boat, the float member being movable vertically relative to the frame. 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 from the float member and trailer under its own power, as well as to move forwardly into the float member and over the trailer to a position to be supported by the trailer when it is pulled fully onto land by a towing vehicle.