Abstract: A carrier rack includes a trailer-hitch ball-engaging mount selectively movable by articulated linkage between a released position and an operative position engagable with a trailer-hitch ball. In the operative position of the ball-engaging mount, an adjustable clamp selectively increases compressive forces of the mount on the ball to a desired loading. The linkage is configured and dimensioned to ensure that it is in a relaxed condition when the ball-engaging mount is in its operative position and subjected to the increased compressive forces applied by the adjustable clamp.