Clunk under drivers side

I have a clunking sound coming from my drivers side that sounds like a stick or something hitting the bottom of the truck just about every time I hit the brakes and I'm going over 45.
I looked underneath and nothing was loose, and no stick or anything was jammed anywhere to be making that sound. I gave everything a good shake
It sounds like a stick and I can feel it sometimes right under my feet when I'm driving any idea what it could be?

 

Is it rotational like clunk clunk clunk clunk with the speed of the wheel or does it clunk just once right when you hit the brakes? Also is it more of a sharper clunk or like dull thud noise? And welcome to TW

 

Its just a single clunk and it doesn't happen every time but it's like a dull one
I wasn't worried about it until I could feel it through the floor
And thanks this place is great lol

 

Check this out ... Possible solution
https://www.tacomaworld.com/threads/tacoma-loose-bed-design-flaw-explanation.388873/

 

Thanks I'll check that out tomorrow