Winch removably mounted on vehicle side rails

A winch assembly is designed so that it can be slidably supported on the side rail of a vehicle. The winch assembly has side walls and a top plate. Slots are formed between the top plate and the side walls. A first bar runs between the side walls at substantially the same elevation as the top plate. A second bar runs between the side walls at an elevation below that of the first bar. A space is formed between the top plate and the first and second bars. The vehicle has a side rail running there around on which the winch assembly is supported. The side rail has a U-shaped bottom piece and a U-shaped top piece which run around the vehicle side walls. A cross member runs between the opposite sides of the cargo compartment The side frame has a U-shaped bottom piece with an arm extending there from, this arm being fitted into a slot in the deck of the vehicle located between the deck and the cross member. The side frame has a U-shaped top piece which fits between the top plate of the winch and the sides of the winch. The winch assembly is thus slidably yet firmly supported on the floor of the vehicle for ready removal for repair and reinstallation.