I mounted this bar to the T-rails that are on my tonneau cover mounted to the bed. The probar and the square bars are the only bars long enough to span the width of the bed. The probar has a clean and functional look for holding surfboards, bikes, racks, boxes, or tents when extra space is needed. The only down side is that you have to get the right hardware to use the probar its a different mounting system that uses the t-track set up. Most things like surfboard pads dont fit very well because the bar itself is pretty chunky. You really have to consider how everything will mount to these bars and there is very little guidance or products made to actually work with these bars without taking into consideration that it has to be a t-track mount.
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