A monitor, which may be closely associated with a handrail, may determine the amount of force applied to the handrail. A technique for providing an updatable result set from multiple joined tables that may include null values for outer-joined tables includes testing for a connection to the unique indexes and the null values. The double-tapered weight has a top weight taper and a lower weight taper. The hitch offset assembly comprises a coupler portion to couple to a hitch coupler device, an upright portion designed for coupling to the down tube of the gooseneck structure of the trailer hitch, and an offset portion that extends between the coupler portion and the upright portion. In one aspect, this airflow region of the venting medium may be free from direct contact with any other portion of the venting system.