I don’t have one or have ever seen one.
However I made several that were very similar for camping.
The grate moves up and down and will easily swing away from the fire.
They were made from an extra heavy duty grate with two couplers welded on and two concrete form stakes.
Not my idea or anything.
My neighbor brought over the materials and asked me to weld them.
I got one out of the deal and love how it works.
I still have it after 20 or so years.