Approximate weight capacity ~1,100lbs
See report on extrusion bars weight limit performance. This provides all the technical data for the extrusion which is the "weakest link" in the bed rack, though they are not weak at all! Running the simulation for 1000lbs on a 53" extrusion supported on each end. Our bed rack mounts them in the Deflection Y configuration. This is 1000lbs applied to a single bar at the weakest point in the center and it shows a deflection of 0.195" and no failure.
We do not have a full analysis of our bed rack ran through a simulation at this time, however, you can see that our rack can handle quite a bit of weight. Many customers run a large RTT up top with hi lifts or gas or recovery boards along the sides along with 360 degrees of lighting.