TracUtility cross-bars are 1.5 inches tall and 4 inches wide.
There are 3 heights of TracUtility racks. The heights of the top of the cross-bar above the top of the service/utility body are:
17 inches for short
22 inches for tall
28 inches for extra tall
The utility body rack base tracks are 24 inches long. A 48 inch long accessory base track is available.
The inverted capital L shaped base-track extrusions are 3.5 inches tall and 2 inches wide. It has one upward facing T-track and one sideways (inward) facing T-track. The top of the T is about 1 inch wide and 0.14 inches thick.
The sliding load-stop\tie-downs are 4.5 inches tall above the top of the cross-bar.