Bed Side Hooks

[Boats&Hoes]

I'm thinking these things may be called something else and that's why I can't find any info on the old internet.
There are about 4 J hooks (maybe fish hooks???) coming out of the bed side, both left and right side. Does anyone know whats the deal with those? Why did some trucks come with them and others did not? Looks like the majority of c10's that have been restored do not have these. I personally think they would look rad kept on there with a nice patina.

Any info you could provide would be helpful. Thank you so much! Oh, and I found some on an earlier 60' Apache and also a 64-65' C10.