Abstract: A trailer adapted to carry in piggy-back fashion, a removable, replaceable dolly onto which small or personal watercraft is to be loaded or off-loaded. The trailer is provided with higher pressure tires capable of withstanding such impacts and jarring as are associated with highway usage, while the dolly is provided with lower pressure tires for travel over sand, dirt, gravel, or other off-the road use. A first stop, on the trailer, limits movement of the dolly once secured; and a second stop, on the dolly, limits the movement of the watercraft. A plurality of rollers are employed to ease the dolly loading with the trailer, and the watercraft loading with the dolly.

Abstract: The elevator construction of the invention includes adjustable length elongated posts and tubes to allow for the simple launching and recovery of personal watercraft by lowering and raising a support cradle without the need for any special order, parts or fabrications for situations where wide variation exists in the distance between a dock or seawall and the ground bottom beneath the water.

Abstract: The roller construction of the invention affords a high degree of support and stability to the launching and recovery of personal watercraft by lowering and raising a cradle through the use of rollers, some of which are positioned above the cradle while others of which are positioned below the cradle--and wherein each roller bears against a side of a polygonal-shaped vertical post along which the cradle rides.

Abstract: A lift harness for use in winching jet skis, boats and similar craft out from the water is described as including a pair of floatation pipes coupled to an overhead metal ring by a pair of fabric straps connecting the pipes and the ring in an "open-tent" configuration. In use, the floatation pipes in the water are manually held apart, the watercraft is guided between the pipes from behind, and the metal ring raised to a davit mechanically lifting the craft from the water in a construction where no metal parts contact the watercraft itself.

Abstract: A boat trailer is described which combines the advantages of previously available hydraulic and roller-type trailer constructions. In a preferred embodiment of the invention, the trailer bed is of a U-frame construction, with a plurality of side rollers and an adjustable roller member for supporting the keel of a boat to be carried about a marina, boat yard, or boat showroom or area. The trailer, at the same time, is arranged to couple to any appropriate towing vehicle by a pivotable tongue, on which a hydraulic cylinder or some other means is secured to tilt the trailer bed and to assist in the loading and unloading of the boat for transport.