Re: bolt bed to frame under wood?
If I understand your question I must state that the plates that are on the bottom of the cross sills are attached only with very small resistance spot welds.
I know this because I had to remove and relocate the plates when I widened the bed on my truck.
I wouldn't trust them to hold the bed on, they were never intended as structural attachments, there purpose is simply to keep the sills from spreading and to serve as a washer between the sills and the frame.
My 2 cents...................
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