Plugging holes in truck bed?

I would think rubber body plugs. Not really any different than the rubber plugs in our trunks, right?
Definitely crossed my mind, sometimes the simple obvious answer is the best, but i figured i would ask

Unless you are hauling sand, why do you want to? Lets the rain water out. My old Dakota and RAM had the rubber plugged anchors down in the bed. I left the plugs out. Lets the water run through, and helps keep the mud flushed out of the anchor pockets
The truck has a tonneau cover on it which does a great job keeping rain (and snow) out

I use the truck as a family vehicle and the bed as a trunk

So it sees a lot of typical family luggage


I figured there isn't much coming in from above, but these holes might allow road debris and water and stuff to come in from the bottom