Plugs in truck bed?

[Diverjer]

Could someone tell me what these holes below rail of truck are for?  Some of them have plugs in them, ( assume that was when new).  Some have no plug, I don't see them being used for tie downs as there isn't a place to hook and sheet metal just too thin, would just bend.   If the plug has been removed, then the same plug was removed across on the other side of bed.  Somewhat concern about getting rock in there when I haul gravel/rock for landscaping, don't want to plug something up that might rust.  There are small holes on floor bed right behind cab, assume to drain water and I doubt rock will go down them unless I load pea gravel.   I do have one job for an underground drain I want to use pea gravel.  My old Dodge didn't have any holes like this. 

 

 

[BringTheRain403]

Moveable tie downs...

Sent from my Pixel 2 XL using Tapatalk

[BringTheRain403]

https://accessories.gmc.com/product/2018/GMC/Sierra%201500/cargo-tie-down-rings-23146899?categoryId=12010

Sent from my Pixel 2 XL using Tapatalk

[Imcrazy]

Yep movable / extra tie downs, I had them in one of my trucks and didn't find them to be useful really...

[Diverjer]

Okay, I see, they must push in there and then twist to tighten down.   The existing built in tie downs seem good enough for me.  You would have to take these out or some kind person would steal them.  I may see if I can buy plugs to put back in, but it looks like if rock did go in them, it would just fall on through. 

 

Thanks for the info, I can see that they could be handy for some things.