I use the stake pockets on my 20ft flat bed, they are very handy. But this raises a good question, they are called stake pockets, not heavy equipment tie-downs.
I'm pretty sure they have no safety weight rating like every other part of the equation from chains, binders, hooks, shackles the trailer itself etc etc.
So I wonder what the trailer manufacturers or the highway safety dept has to say about using stake pockets to hold equipment down ???
Ideally slip hooks would be the better choice for D-rings, as opposed to grab hooks IMO.
Here's a pic of a brand new trailer, no D-rings, just stake pockets. And a pic of my set up.
JB