Abstract: In a boat trailer for hauling a tunnel hull speed boat, wheels revolvably mounted on a cradle on which the boat rests are arranged to allow the periphery of the wheels to engage the overhead of the tunnel of the boat to permit the boat to roll easily from the trailer when released to do so, and to be easily mounted on the trailer from the water when the boat is afloat. The wheels are preferably mounted on stanchions, and arranged to be raised to the overhead engaging position from a position at which the wheels are not supporting the boat.

Abstract: An over-the-road trailer for an over-width object, such as an ocean-going speedboat, is made up of a cradle on which the object is seated, a wheeled frame, carrying the cradle, and a device for moving the cradle relative to the frame from a generally horizontal position to a position at an angle to the frame sufficient to make the effective width of the object within legal limits for over-the-road travel. The moving device includes a lifting arm mounted on a pivot pin at one end on the frame and pivotally connected at another end to the cradle. A hydraulic cylinder and piston are mounted on the frame and connected to the lifting arm. A track, mounted on the frame, has a ramp part on the side of the frame opposite the pivot pin, and a linear section tending slightly upwardly in a direction towards the pivot pin. An arm on the cradle has, at its outer end, a wheel that runs in the track and moves in a direction toward the pivot in response to the raising of the cradle by the lifting arm.