Abstract: A boat engagement and support device having a boat hull engagement assembly to engage the boat hull, a lever pivotally attached to the boat hull engagement assembly and at least one wheel associated with both the boat hull engagement assembly and the lever whereby rotation of the lever relative to the boat hull engagement assembly forces the at least one wheel to abut the ground surface and continued movement of the lever raises and lowers the boat hull engagement assembly.

Abstract: A collapsible trailer has a trailer frame adapted to support a boat or marine vessel, the trailer frame including at least one longitudinal member and at least a pair of transverse members and at least two wheels, the wheels removably associated with opposed ends of a first of the pair of transverse members and marine vessel support means removably associated with the other of the pair of transverse members wherein the trailer frame is adapted to assume a use condition with the wheels attached for supporting a boat or marine vessel on the trailer and a collapsed condition with the wheels removed in which the trailer occupies less space than in the use condition.

Abstract: A collapsible trailer has a trailer frame adapted to support a boat or marine vessel, the trailer frame including at least one longitudinal member and at least a pair of transverse members and at least two wheels, the wheels removably associated with opposed ends of a first of the pair of transverse members and marine vessel support means removably associated with the other of the pair of transverse members wherein the trailer frame is adapted to assume a use condition with the wheels attached for supporting a boat or marine vessel on the trailer and a collapsed condition with the wheels removed in which the trailer occupies less space than in the use condition.