Punches/indentations in bed sides

[nurp42]

Are these three punch marks at the rear end of both bed sides there to serve as drill guides to install something (and if so, what)?

If I'm the only one who doesn't know, sorry for the dumb question. Thanks for any help.

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[Miqie]

Isn't that the area where bed stiffeners would be mounted?

 

[Goriders]

Maybe the bed extender?

 

[WKTJR1]

Screw hole location for the bed extender.

 

[nurp42]

Thanks for the info guys. Appreciate the feedback.

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