Got it, and I am the OP.The OP asked about the weight rating of the bed sides. That's all I was talking about.
You're probably right but my point was that there is room for the scenario where they make a good strong bed cover and advertise its impressive weight rating to attract buyers, without mentioning (maybe mentioned somewhere in fine print) that the rating of their bed cover greatly exceeds the capacity of the bed rails so carrying the advertised weight is therefore not achievable without modification to the truck. Kind of like how they market bolt-on superchargers that add 250HP to your engine but they don't tell you that along with that extra HP you'll need to beef up your driveline or else destroy it - that's something they just expect you to already know.The Diamondback SXS carriers are carrying the side by sides on top of the truck. It's not crushing them, so apparently whatever the bed side is rated for is enough. I don't know if they have any other support that extends down to the bottom of the bed.