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Re: bed mount question - bent frame from towing?
Rear of the axle, the cross sills sit directly on the top flange of the frame rail. Forward of the axle, the cross sills sit on the stand-off mounts, in order to make up the distance to the top flange of the frame rail, due to the offset profile of the frame rail.
It would take a massive amount of weight on the rear portion of the body, in order to bend the frame tails downward. Additionally, this much weight would damage the floor structure. If it was tongue weight on a receiver hitch, the weight would be transferred into the frame rails and the suspension would bottom out. I don't think a conventional step bumper could withstand weight adequate to make the rear frame rails bend, without failing itself.
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