Bed anchor load rating?

[skiteton]

Does anyone know the load/weight rating of each anchor point in the bed? I'm thinking of making a shelf and don't want to overload one corner and deform the body or anchor itself.

I couldn't find anything in my manual. There's a callout our for the tailgate anchor points (400 lbs between the 2 "bottle openers") but nothing for downward force on the bed anchors.

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